961 B
961 B
id | challengeType | title | forumTopicId |
---|---|---|---|
5900f5271000cf542c51003a | 5 | Problem 443: GCD sequence | 302115 |
Description
Let g(n) be a sequence defined as follows: g(4) = 13, g(n) = g(n-1) + gcd(n, g(n-1)) for n > 4.
The first few values are:
n 4567891011121314151617181920... g(n) 1314161718272829303132333451545560...
You are given that g(1 000) = 2524 and g(1 000 000) = 2624152.
Find g(1015).
Instructions
Tests
tests:
- text: <code>euler443()</code> should return 2744233049300770.
testString: assert.strictEqual(euler443(), 2744233049300770);
Challenge Seed
function euler443() {
return true;
}
euler443();
Solution
// solution required