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Find the Sum

Math brain teasers require computations to solve.


Puzzle ID:#39976
Fun:*** (2.1)
Difficulty:*** (2.61)
Submitted By:shenqiangAcn****!!




Find the sum of all prime numbers between 1 and 100 that are simultaneously 1 greater than a multiple of 4 and 1 less than a multiple of 5.

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Jan 13, 2009

I did it a little different. The numbers on either side must be even. The number below is 2 x an even number, so the number above is 2 x 5 x an odd number. That gives the odd multiples of 10 as the number above the prime, leaving just the 5 numbers to check.

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