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A puzzle related to mathematical facts and objects, whose solution needs mathematical arguments. General mathematics questions are off-topic but can be asked on Mathematics Stack Exchange.

4 votes
Accepted

Primes from arithmetic and geometric progressions

The series are: and Method:
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2 votes
Accepted

The first 10 prime butterflies

First, observe the facts that: Proceeding further, the final answer is then:
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2 votes

A robot surviving on top of a 3x3 platform

EDIT : I found a better solution for Omitting the older solution as that is no more valid
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1 vote

How to fill up the numbers in a set of empty discs drawing a pentagon?

The answer is: Because the filled-up pentagon looks like: The sum in each edge is 38. This is the maximum I got after several trial & errors.
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1 vote

Covering an 8x8 grid with W pentominoes

Here is a solution with 16 pentominos:
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