Variation on four 4's game but with digits of number
Here's one I came up with years ago and have toyed with off and on since then. For every two-digit number, create the number using four of its digits. Rules: You must use exactly...
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Here's one I came up with years ago and have toyed with off and on since then. For every two-digit number, create the number using four of its digits. Rules: You must use exactly...
Inspired from Can you name the country code? and What is a Numberâ„¢? series Given the Numbers of the 11 Words in the following table, can you figure out the Numberâ„¢ of WAR?...
Find all digits in the equation: $$abc⋅de-fgh⋅ij = 0$$ where: Each letter represents a distinct digit from 0 to 9. No digit is repeated anywhere in the expression. The leading dig...
I've thought up a cipher method. Here are three messages enciphered using it, for you to decipher. They're arranged from easiest to hardest. I'm not sure how hard it'll be to decip...
What's the hidden final answer?
I have an annoying coworker named Theodore. Theodore likes sequences. At lunch, he handed me this: AAA = (2,1) (9,4) (38,17) ABC = (2,1) (38,17) (682,305) BAA = (9,4) (9,4) (38,17)...
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...
Find all 3 digit abc such that either of the product of ab and c or a and bc is equal to cba. I mean, as an example, when abc=264, then 26*4=462. Note that abc and cba does mean co...
The Mathematician's Lament: Decode the Hidden Number in This Cryptic Recipe Found in the margins of Dr. Aris Thorne's final paper on transcendental number theory, submitted hours b...
By determining the result of the computation, the language, and the function ip compute the integer pi. ord((ip(4)*ip(2)*ip(pi)).to_bytes(2,'little').decode())
This puzzle is an entry in Monthly Topic Challenge May 2026: Network Parody. I'm trying to identify some mathematicians who formed a famous set from their initial work. I have a li...
Use 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 only once to make 111111111(9 digits). You can use: concatenation in base 10, +, -, ×, ÷, ! (factorial), () (parentheses) I am sure that mine use...
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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