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Recent items include:

  • Writing down harmonic numbers
  • Rational thinking required
  • Please help me fill my number square.

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johndcook.com /2 weeks ago

Writing down harmonic numbers

The nth harmonic number is the sum of the reciprocals of the first n positive integers. Hn = 1 + 1/2 + 1/3 + 1/4 + … + 1/n The product of all the denominators is n!, so you co...

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puzzling.stackexchange.com /1 month ago

Rational thinking required

Inspiration for this puzzle came from this recent puzzle: Find all digits in abc·de - fgh·ij=0 where each digit 0–9 is used exactly once Rational Thinking Required A, B, C, D, E, F...

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puzzling.stackexchange.com /4 weeks ago

Please help me fill my number square.

I don't like to cross words with people, I would rather cross numbers with them. Have fun! 1A: Baby's first numbers 4A: Kaprekar's favorite 8A: Baking some pie 10A: Abundent and Sp...

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puzzling.stackexchange.com /1 month ago

How are these numbers similar?

Here are three sets of numbers: 225088i, 136108, 20000, 19521, 145451, 136199 90482, 145452, 38628.3, 225088 66652, 385571, 50000i, 38083, 134340, 90568 What do these numbers have...

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Sources covering Number Theory

puzzling.stackexchange.com

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johndcook.com

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