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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...
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...
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...
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...
There are years from this century that are not really prime or composite when interpreted in certain way. Prime but not really prime: 2027 2029 2039 2053 2063 2069 2081 2083 2089...
Years ago I wrote about Gilbreath’s conjecture. It’s a simple conjecture; you could explain it to anyone who understands what prime numbers are. See the linked post for a descripti...
If all the two-digit positive integers are placed in the order in which each of them appears for the first time as the prefix of a perfect square, which is the last number in the l...
You come across a written note in the course of your investigations. Most of the note is horribly smudged with no words immediately legible. If you do some analysis on the smudges,...
This puzzle is part of July's Monthly Topic Challenge. The Obscure Calendar Club October 9th is Curious Events Day, so I want to tell you a story about a sequence of rather curious...
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