n= 2^n-1. [u]Perfect numbers[u]
2 3 × 2 6
3 7 × 4 28
5 31 × 16 496
7 127 × a b
Find the pattern in the third column to find 'a', multiply a by 127 to get b. Comment below and if your answer is right I will give you a cookie.
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Oh i see 8,128