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The National Cipher Challenge

Reply To: Puzzles

#97861
USB-C_is_supreme
Participant

Hi fellow puzzle lovers!

I have a maths puzzle that is simple but brilliant, and the solution is quite fun. Here it is:

Katie pretends she has a pack of cards numbered 1 to 10,000. She removes every card that has a square number writen on it, leaving a certain amount of cards, N, left in the deck. She then rubs out all the numbers on the remaining cards and renumbers them 1 to N. This step is repeated with N getting smaller after every step.

How many steps are needed until there is only 1 card remaining?

Hope you had fun solving this!

-USB-C

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