Euler's Totient Function for n = 1..1000
Note: This page uses MathML. To view it properly, you need a MathML-enabled browser. You may also have to install some fonts.
Euler's totient function (also known as the "phi function") counts the number of natural integers less than n that are coprime to n. It is very useful in number theory, e.g. to compute the number of primitive roots modulo a prime n. For more information, see:
- Wikipedia
- Encyclopedia of Mathematics
- Lindsay N. Childs, A Concrete Introduction to Higher Algebra, 3rd ed., Springer, 2009, pp. 111 and 179-180.
- G.H. Hardy and E.M. Wright, An Introduction to the Theory of Numbers, 6th ed., Oxford University Press, 2008, pp. 63-65.
The values presented below were computed in 2015 using a Python program.
| n | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| φ(n) | 1 | 1 | 2 | 2 | 4 | 2 | 6 | 4 | 6 | 4 |
| n | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 |
| φ(n) | 10 | 4 | 12 | 6 | 8 | 8 | 16 | 6 | 18 | 8 |
| n | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 |
| φ(n) | 12 | 10 | 22 | 8 | 20 | 12 | 18 | 12 | 28 | 8 |
| n | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 |
| φ(n) | 30 | 16 | 20 | 16 | 24 | 12 | 36 | 18 | 24 | 16 |
| n | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 |
| φ(n) | 40 | 12 | 42 | 20 | 24 | 22 | 46 | 16 | 42 | 20 |
| n | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 |
| φ(n) | 32 | 24 | 52 | 18 | 40 | 24 | 36 | 28 | 58 | 16 |
| n | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 |
| φ(n) | 60 | 30 | 36 | 32 | 48 | 20 | 66 | 32 | 44 | 24 |
| n | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 |
| φ(n) | 70 | 24 | 72 | 36 | 40 | 36 | 60 | 24 | 78 | 32 |
| n | 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 |
| φ(n) | 54 | 40 | 82 | 24 | 64 | 42 | 56 | 40 | 88 | 24 |
| n | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 |
| φ(n) | 72 | 44 | 60 | 46 | 72 | 32 | 96 | 42 | 60 | 40 |
| n | 101 | 102 | 103 | 104 | 105 | 106 | 107 | 108 | 109 | 110 |
| φ(n) | 100 | 32 | 102 | 48 | 48 | 52 | 106 | 36 | 108 | 40 |
| n | 111 | 112 | 113 | 114 | 115 | 116 | 117 | 118 | 119 | 120 |
| φ(n) | 72 | 48 | 112 | 36 | 88 | 56 | 72 | 58 | 96 | 32 |
| n | 121 | 122 | 123 | 124 | 125 | 126 | 127 | 128 | 129 | 130 |
| φ(n) | 110 | 60 | 80 | 60 | 100 | 36 | 126 | 64 | 84 | 48 |
| n | 131 | 132 | 133 | 134 | 135 | 136 | 137 | 138 | 139 | 140 |
| φ(n) | 130 | 40 | 108 | 66 | 72 | 64 | 136 | 44 | 138 | 48 |
| n | 141 | 142 | 143 | 144 | 145 | 146 | 147 | 148 | 149 | 150 |
| φ(n) | 92 | 70 | 120 | 48 | 112 | 72 | 84 | 72 | 148 | 40 |
| n | 151 | 152 | 153 | 154 | 155 | 156 | 157 | 158 | 159 | 160 |
| φ(n) | 150 | 72 | 96 | 60 | 120 | 48 | 156 | 78 | 104 | 64 |
| n | 161 | 162 | 163 | 164 | 165 | 166 | 167 | 168 | 169 | 170 |
| φ(n) | 132 | 54 | 162 | 80 | 80 | 82 | 166 | 48 | 156 | 64 |
| n | 171 | 172 | 173 | 174 | 175 | 176 | 177 | 178 | 179 | 180 |
| φ(n) | 108 | 84 | 172 | 56 | 120 | 80 | 116 | 88 | 178 | 48 |
| n | 181 | 182 | 183 | 184 | 185 | 186 | 187 | 188 | 189 | 190 |
| φ(n) | 180 | 72 | 120 | 88 | 144 | 60 | 160 | 92 | 108 | 72 |
| n | 191 | 192 | 193 | 194 | 195 | 196 | 197 | 198 | 199 | 200 |
| φ(n) | 190 | 64 | 192 | 96 | 96 | 84 | 196 | 60 | 198 | 80 |
| n | 201 | 202 | 203 | 204 | 205 | 206 | 207 | 208 | 209 | 210 |
| φ(n) | 132 | 100 | 168 | 64 | 160 | 102 | 132 | 96 | 180 | 48 |
| n | 211 | 212 | 213 | 214 | 215 | 216 | 217 | 218 | 219 | 220 |
| φ(n) | 210 | 104 | 140 | 106 | 168 | 72 | 180 | 108 | 144 | 80 |
| n | 221 | 222 | 223 | 224 | 225 | 226 | 227 | 228 | 229 | 230 |
| φ(n) | 192 | 72 | 222 | 96 | 120 | 112 | 226 | 72 | 228 | 88 |
| n | 231 | 232 | 233 | 234 | 235 | 236 | 237 | 238 | 239 | 240 |
| φ(n) | 120 | 112 | 232 | 72 | 184 | 116 | 156 | 96 | 238 | 64 |
| n | 241 | 242 | 243 | 244 | 245 | 246 | 247 | 248 | 249 | 250 |
| φ(n) | 240 | 110 | 162 | 120 | 168 | 80 | 216 | 120 | 164 | 100 |
| n | 251 | 252 | 253 | 254 | 255 | 256 | 257 | 258 | 259 | 260 |
| φ(n) | 250 | 72 | 220 | 126 | 128 | 128 | 256 | 84 | 216 | 96 |
| n | 261 | 262 | 263 | 264 | 265 | 266 | 267 | 268 | 269 | 270 |
| φ(n) | 168 | 130 | 262 | 80 | 208 | 108 | 176 | 132 | 268 | 72 |
| n | 271 | 272 | 273 | 274 | 275 | 276 | 277 | 278 | 279 | 280 |
| φ(n) | 270 | 128 | 144 | 136 | 200 | 88 | 276 | 138 | 180 | 96 |
| n | 281 | 282 | 283 | 284 | 285 | 286 | 287 | 288 | 289 | 290 |
| φ(n) | 280 | 92 | 282 | 140 | 144 | 120 | 240 | 96 | 272 | 112 |
| n | 291 | 292 | 293 | 294 | 295 | 296 | 297 | 298 | 299 | 300 |
| φ(n) | 192 | 144 | 292 | 84 | 232 | 144 | 180 | 148 | 264 | 80 |
| n | 301 | 302 | 303 | 304 | 305 | 306 | 307 | 308 | 309 | 310 |
| φ(n) | 252 | 150 | 200 | 144 | 240 | 96 | 306 | 120 | 204 | 120 |
| n | 311 | 312 | 313 | 314 | 315 | 316 | 317 | 318 | 319 | 320 |
| φ(n) | 310 | 96 | 312 | 156 | 144 | 156 | 316 | 104 | 280 | 128 |
| n | 321 | 322 | 323 | 324 | 325 | 326 | 327 | 328 | 329 | 330 |
| φ(n) | 212 | 132 | 288 | 108 | 240 | 162 | 216 | 160 | 276 | 80 |
| n | 331 | 332 | 333 | 334 | 335 | 336 | 337 | 338 | 339 | 340 |
| φ(n) | 330 | 164 | 216 | 166 | 264 | 96 | 336 | 156 | 224 | 128 |
| n | 341 | 342 | 343 | 344 | 345 | 346 | 347 | 348 | 349 | 350 |
| φ(n) | 300 | 108 | 294 | 168 | 176 | 172 | 346 | 112 | 348 | 120 |
| n | 351 | 352 | 353 | 354 | 355 | 356 | 357 | 358 | 359 | 360 |
| φ(n) | 216 | 160 | 352 | 116 | 280 | 176 | 192 | 178 | 358 | 96 |
| n | 361 | 362 | 363 | 364 | 365 | 366 | 367 | 368 | 369 | 370 |
| φ(n) | 342 | 180 | 220 | 144 | 288 | 120 | 366 | 176 | 240 | 144 |
| n | 371 | 372 | 373 | 374 | 375 | 376 | 377 | 378 | 379 | 380 |
| φ(n) | 312 | 120 | 372 | 160 | 200 | 184 | 336 | 108 | 378 | 144 |
| n | 381 | 382 | 383 | 384 | 385 | 386 | 387 | 388 | 389 | 390 |
| φ(n) | 252 | 190 | 382 | 128 | 240 | 192 | 252 | 192 | 388 | 96 |
| n | 391 | 392 | 393 | 394 | 395 | 396 | 397 | 398 | 399 | 400 |
| φ(n) | 352 | 168 | 260 | 196 | 312 | 120 | 396 | 198 | 216 | 160 |
| n | 401 | 402 | 403 | 404 | 405 | 406 | 407 | 408 | 409 | 410 |
| φ(n) | 400 | 132 | 360 | 200 | 216 | 168 | 360 | 128 | 408 | 160 |
| n | 411 | 412 | 413 | 414 | 415 | 416 | 417 | 418 | 419 | 420 |
| φ(n) | 272 | 204 | 348 | 132 | 328 | 192 | 276 | 180 | 418 | 96 |
| n | 421 | 422 | 423 | 424 | 425 | 426 | 427 | 428 | 429 | 430 |
| φ(n) | 420 | 210 | 276 | 208 | 320 | 140 | 360 | 212 | 240 | 168 |
| n | 431 | 432 | 433 | 434 | 435 | 436 | 437 | 438 | 439 | 440 |
| φ(n) | 430 | 144 | 432 | 180 | 224 | 216 | 396 | 144 | 438 | 160 |
| n | 441 | 442 | 443 | 444 | 445 | 446 | 447 | 448 | 449 | 450 |
| φ(n) | 252 | 192 | 442 | 144 | 352 | 222 | 296 | 192 | 448 | 120 |
| n | 451 | 452 | 453 | 454 | 455 | 456 | 457 | 458 | 459 | 460 |
| φ(n) | 400 | 224 | 300 | 226 | 288 | 144 | 456 | 228 | 288 | 176 |
| n | 461 | 462 | 463 | 464 | 465 | 466 | 467 | 468 | 469 | 470 |
| φ(n) | 460 | 120 | 462 | 224 | 240 | 232 | 466 | 144 | 396 | 184 |
| n | 471 | 472 | 473 | 474 | 475 | 476 | 477 | 478 | 479 | 480 |
| φ(n) | 312 | 232 | 420 | 156 | 360 | 192 | 312 | 238 | 478 | 128 |
| n | 481 | 482 | 483 | 484 | 485 | 486 | 487 | 488 | 489 | 490 |
| φ(n) | 432 | 240 | 264 | 220 | 384 | 162 | 486 | 240 | 324 | 168 |
| n | 491 | 492 | 493 | 494 | 495 | 496 | 497 | 498 | 499 | 500 |
| φ(n) | 490 | 160 | 448 | 216 | 240 | 240 | 420 | 164 | 498 | 200 |
| n | 501 | 502 | 503 | 504 | 505 | 506 | 507 | 508 | 509 | 510 |
| φ(n) | 332 | 250 | 502 | 144 | 400 | 220 | 312 | 252 | 508 | 128 |
| n | 511 | 512 | 513 | 514 | 515 | 516 | 517 | 518 | 519 | 520 |
| φ(n) | 432 | 256 | 324 | 256 | 408 | 168 | 460 | 216 | 344 | 192 |
| n | 521 | 522 | 523 | 524 | 525 | 526 | 527 | 528 | 529 | 530 |
| φ(n) | 520 | 168 | 522 | 260 | 240 | 262 | 480 | 160 | 506 | 208 |
| n | 531 | 532 | 533 | 534 | 535 | 536 | 537 | 538 | 539 | 540 |
| φ(n) | 348 | 216 | 480 | 176 | 424 | 264 | 356 | 268 | 420 | 144 |
| n | 541 | 542 | 543 | 544 | 545 | 546 | 547 | 548 | 549 | 550 |
| φ(n) | 540 | 270 | 360 | 256 | 432 | 144 | 546 | 272 | 360 | 200 |
| n | 551 | 552 | 553 | 554 | 555 | 556 | 557 | 558 | 559 | 560 |
| φ(n) | 504 | 176 | 468 | 276 | 288 | 276 | 556 | 180 | 504 | 192 |
| n | 561 | 562 | 563 | 564 | 565 | 566 | 567 | 568 | 569 | 570 |
| φ(n) | 320 | 280 | 562 | 184 | 448 | 282 | 324 | 280 | 568 | 144 |
| n | 571 | 572 | 573 | 574 | 575 | 576 | 577 | 578 | 579 | 580 |
| φ(n) | 570 | 240 | 380 | 240 | 440 | 192 | 576 | 272 | 384 | 224 |
| n | 581 | 582 | 583 | 584 | 585 | 586 | 587 | 588 | 589 | 590 |
| φ(n) | 492 | 192 | 520 | 288 | 288 | 292 | 586 | 168 | 540 | 232 |
| n | 591 | 592 | 593 | 594 | 595 | 596 | 597 | 598 | 599 | 600 |
| φ(n) | 392 | 288 | 592 | 180 | 384 | 296 | 396 | 264 | 598 | 160 |
| n | 601 | 602 | 603 | 604 | 605 | 606 | 607 | 608 | 609 | 610 |
| φ(n) | 600 | 252 | 396 | 300 | 440 | 200 | 606 | 288 | 336 | 240 |
| n | 611 | 612 | 613 | 614 | 615 | 616 | 617 | 618 | 619 | 620 |
| φ(n) | 552 | 192 | 612 | 306 | 320 | 240 | 616 | 204 | 618 | 240 |
| n | 621 | 622 | 623 | 624 | 625 | 626 | 627 | 628 | 629 | 630 |
| φ(n) | 396 | 310 | 528 | 192 | 500 | 312 | 360 | 312 | 576 | 144 |
| n | 631 | 632 | 633 | 634 | 635 | 636 | 637 | 638 | 639 | 640 |
| φ(n) | 630 | 312 | 420 | 316 | 504 | 208 | 504 | 280 | 420 | 256 |
| n | 641 | 642 | 643 | 644 | 645 | 646 | 647 | 648 | 649 | 650 |
| φ(n) | 640 | 212 | 642 | 264 | 336 | 288 | 646 | 216 | 580 | 240 |
| n | 651 | 652 | 653 | 654 | 655 | 656 | 657 | 658 | 659 | 660 |
| φ(n) | 360 | 324 | 652 | 216 | 520 | 320 | 432 | 276 | 658 | 160 |
| n | 661 | 662 | 663 | 664 | 665 | 666 | 667 | 668 | 669 | 670 |
| φ(n) | 660 | 330 | 384 | 328 | 432 | 216 | 616 | 332 | 444 | 264 |
| n | 671 | 672 | 673 | 674 | 675 | 676 | 677 | 678 | 679 | 680 |
| φ(n) | 600 | 192 | 672 | 336 | 360 | 312 | 676 | 224 | 576 | 256 |
| n | 681 | 682 | 683 | 684 | 685 | 686 | 687 | 688 | 689 | 690 |
| φ(n) | 452 | 300 | 682 | 216 | 544 | 294 | 456 | 336 | 624 | 176 |
| n | 691 | 692 | 693 | 694 | 695 | 696 | 697 | 698 | 699 | 700 |
| φ(n) | 690 | 344 | 360 | 346 | 552 | 224 | 640 | 348 | 464 | 240 |
| n | 701 | 702 | 703 | 704 | 705 | 706 | 707 | 708 | 709 | 710 |
| φ(n) | 700 | 216 | 648 | 320 | 368 | 352 | 600 | 232 | 708 | 280 |
| n | 711 | 712 | 713 | 714 | 715 | 716 | 717 | 718 | 719 | 720 |
| φ(n) | 468 | 352 | 660 | 192 | 480 | 356 | 476 | 358 | 718 | 192 |
| n | 721 | 722 | 723 | 724 | 725 | 726 | 727 | 728 | 729 | 730 |
| φ(n) | 612 | 342 | 480 | 360 | 560 | 220 | 726 | 288 | 486 | 288 |
| n | 731 | 732 | 733 | 734 | 735 | 736 | 737 | 738 | 739 | 740 |
| φ(n) | 672 | 240 | 732 | 366 | 336 | 352 | 660 | 240 | 738 | 288 |
| n | 741 | 742 | 743 | 744 | 745 | 746 | 747 | 748 | 749 | 750 |
| φ(n) | 432 | 312 | 742 | 240 | 592 | 372 | 492 | 320 | 636 | 200 |
| n | 751 | 752 | 753 | 754 | 755 | 756 | 757 | 758 | 759 | 760 |
| φ(n) | 750 | 368 | 500 | 336 | 600 | 216 | 756 | 378 | 440 | 288 |
| n | 761 | 762 | 763 | 764 | 765 | 766 | 767 | 768 | 769 | 770 |
| φ(n) | 760 | 252 | 648 | 380 | 384 | 382 | 696 | 256 | 768 | 240 |
| n | 771 | 772 | 773 | 774 | 775 | 776 | 777 | 778 | 779 | 780 |
| φ(n) | 512 | 384 | 772 | 252 | 600 | 384 | 432 | 388 | 720 | 192 |
| n | 781 | 782 | 783 | 784 | 785 | 786 | 787 | 788 | 789 | 790 |
| φ(n) | 700 | 352 | 504 | 336 | 624 | 260 | 786 | 392 | 524 | 312 |
| n | 791 | 792 | 793 | 794 | 795 | 796 | 797 | 798 | 799 | 800 |
| φ(n) | 672 | 240 | 720 | 396 | 416 | 396 | 796 | 216 | 736 | 320 |
| n | 801 | 802 | 803 | 804 | 805 | 806 | 807 | 808 | 809 | 810 |
| φ(n) | 528 | 400 | 720 | 264 | 528 | 360 | 536 | 400 | 808 | 216 |
| n | 811 | 812 | 813 | 814 | 815 | 816 | 817 | 818 | 819 | 820 |
| φ(n) | 810 | 336 | 540 | 360 | 648 | 256 | 756 | 408 | 432 | 320 |
| n | 821 | 822 | 823 | 824 | 825 | 826 | 827 | 828 | 829 | 830 |
| φ(n) | 820 | 272 | 822 | 408 | 400 | 348 | 826 | 264 | 828 | 328 |
| n | 831 | 832 | 833 | 834 | 835 | 836 | 837 | 838 | 839 | 840 |
| φ(n) | 552 | 384 | 672 | 276 | 664 | 360 | 540 | 418 | 838 | 192 |
| n | 841 | 842 | 843 | 844 | 845 | 846 | 847 | 848 | 849 | 850 |
| φ(n) | 812 | 420 | 560 | 420 | 624 | 276 | 660 | 416 | 564 | 320 |
| n | 851 | 852 | 853 | 854 | 855 | 856 | 857 | 858 | 859 | 860 |
| φ(n) | 792 | 280 | 852 | 360 | 432 | 424 | 856 | 240 | 858 | 336 |
| n | 861 | 862 | 863 | 864 | 865 | 866 | 867 | 868 | 869 | 870 |
| φ(n) | 480 | 430 | 862 | 288 | 688 | 432 | 544 | 360 | 780 | 224 |
| n | 871 | 872 | 873 | 874 | 875 | 876 | 877 | 878 | 879 | 880 |
| φ(n) | 792 | 432 | 576 | 396 | 600 | 288 | 876 | 438 | 584 | 320 |
| n | 881 | 882 | 883 | 884 | 885 | 886 | 887 | 888 | 889 | 890 |
| φ(n) | 880 | 252 | 882 | 384 | 464 | 442 | 886 | 288 | 756 | 352 |
| n | 891 | 892 | 893 | 894 | 895 | 896 | 897 | 898 | 899 | 900 |
| φ(n) | 540 | 444 | 828 | 296 | 712 | 384 | 528 | 448 | 840 | 240 |
| n | 901 | 902 | 903 | 904 | 905 | 906 | 907 | 908 | 909 | 910 |
| φ(n) | 832 | 400 | 504 | 448 | 720 | 300 | 906 | 452 | 600 | 288 |
| n | 911 | 912 | 913 | 914 | 915 | 916 | 917 | 918 | 919 | 920 |
| φ(n) | 910 | 288 | 820 | 456 | 480 | 456 | 780 | 288 | 918 | 352 |
| n | 921 | 922 | 923 | 924 | 925 | 926 | 927 | 928 | 929 | 930 |
| φ(n) | 612 | 460 | 840 | 240 | 720 | 462 | 612 | 448 | 928 | 240 |
| n | 931 | 932 | 933 | 934 | 935 | 936 | 937 | 938 | 939 | 940 |
| φ(n) | 756 | 464 | 620 | 466 | 640 | 288 | 936 | 396 | 624 | 368 |
| n | 941 | 942 | 943 | 944 | 945 | 946 | 947 | 948 | 949 | 950 |
| φ(n) | 940 | 312 | 880 | 464 | 432 | 420 | 946 | 312 | 864 | 360 |
| n | 951 | 952 | 953 | 954 | 955 | 956 | 957 | 958 | 959 | 960 |
| φ(n) | 632 | 384 | 952 | 312 | 760 | 476 | 560 | 478 | 816 | 256 |
| n | 961 | 962 | 963 | 964 | 965 | 966 | 967 | 968 | 969 | 970 |
| φ(n) | 930 | 432 | 636 | 480 | 768 | 264 | 966 | 440 | 576 | 384 |
| n | 971 | 972 | 973 | 974 | 975 | 976 | 977 | 978 | 979 | 980 |
| φ(n) | 970 | 324 | 828 | 486 | 480 | 480 | 976 | 324 | 880 | 336 |
| n | 981 | 982 | 983 | 984 | 985 | 986 | 987 | 988 | 989 | 990 |
| φ(n) | 648 | 490 | 982 | 320 | 784 | 448 | 552 | 432 | 924 | 240 |
| n | 991 | 992 | 993 | 994 | 995 | 996 | 997 | 998 | 999 | 1000 |
| φ(n) | 990 | 480 | 660 | 420 | 792 | 328 | 996 | 498 | 648 | 400 |
J.P. Martin-Flatin