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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:
2
votes
Accepted
The first 10 prime butterflies
First, observe the facts that:
Proceeding further, the final answer is then:
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
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.
1
vote
Covering an 8x8 grid with W pentominoes
Here is a solution with 16 pentominos: