The Best Number Is 73. Why? 73 Is... - The Big Bang Theory

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• What Is The Best Number, Mathematically? - Quora

• Top 10 Greatest Numbers - TheTopTens

• Which Is The Most Powerful Number In Numerology?

• Perfect Number - Wikipedia

• [PDF] Is 73 The Best Number? - Dartmouth College Mathematics

• What Are Perfect Numbers? Definition, Examples, And Facts

• Perfect Number | Definition & Facts - Encyclopedia Britannica

• The World's Most Popular Numbers [Excerpt] - Scientific American

• Seven Is World's Favorite Number, Says Math Writer Alex Bellos | Time

• The 10 Most Important Numbers In The World - Business Insider

• What's The Best Number? | The Economist

• 13 Fascinating Numbers Around Us — When Beauty Meets Math

• Why These Are The Best Numbers! - YouTube