freeCodeCamp/problem-439-sum-of-sum-of-divisors.english.md at 9a315e237af93580c8cab924951d948c95829b11

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Valeriy 79d9012432 fix(curriculum): quotes in tests (#18828 )

* fix(curriculum): tests quotes

* fix(curriculum): fill seed-teardown

* fix(curriculum): fix tests and remove unneeded seed-teardown

2018-10-20 23:32:47 +05:30

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id, challengeType, title

id	challengeType	title
5900f5231000cf542c510035	5	Problem 439: Sum of sum of divisors

Description

Let d(k) be the sum of all divisors of k. We define the function S(N) = ∑1≤i≤N ∑1≤j≤Nd(i·j). For example, S(3) = d(1) + d(2) + d(3) + d(2) + d(4) + d(6) + d(3) + d(6) + d(9) = 59.

You are given that S(103) = 563576517282 and S(105) mod 109 = 215766508. Find S(1011) mod 109.

Instructions

Tests

tests:
  - text: <code>euler439()</code> should return 968697378.
    testString: assert.strictEqual(euler439(), 968697378, '<code>euler439()</code> should return 968697378.');

Challenge Seed

function euler439() {
  // Good luck!
  return true;
}

euler439();

Solution

// solution required

981 B Raw Blame History