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i did not understand: 65 0 :: For the first one, the only integers less than 65 for which sigma2(n) is a square are 1 and 42, hence the answer is 43.
plz. explain.
also give more test case
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Project Euler #211: Divisor Square Sum
You are viewing a single comment's thread. Return to all comments →
i did not understand: 65 0 :: For the first one, the only integers less than 65 for which sigma2(n) is a square are 1 and 42, hence the answer is 43.
plz. explain.
also give more test case