641 B
641 B
id | title | challengeType | forumTopicId |
---|---|---|---|
5900f3e41000cf542c50fef7 | Problem 120: Square remainders | 5 | 301747 |
--description--
Let r be the remainder when (a−1)n + (a+1)n is divided by a2.
For example, if a = 7 and n = 3, then r = 42: 63 + 83 = 728 ≡ 42 mod 49. And as n varies, so too will r, but for a = 7 it turns out that rmax = 42.
For 3 ≤ a ≤ 1000, find ∑ rmax.
--hints--
euler120()
should return 333082500.
assert.strictEqual(euler120(), 333082500);
--seed--
--seed-contents--
function euler120() {
return true;
}
euler120();
--solutions--
// solution required