freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-258-a-lagged-fibonacci-sequence.english.md

id, challengeType, title, forumTopicId

id	challengeType	title	forumTopicId
5900f46e1000cf542c50ff81	5	Problem 258: A lagged Fibonacci sequence	301906

Description

A sequence is defined as:

gk = 1, for 0 ≤ k ≤ 1999 gk = gk-2000 + gk-1999, for k ≥ 2000. Find gk mod 20092010 for k = 1018.

Instructions

Tests

tests:
  - text: <code>euler258()</code> should return 12747994.
    testString: assert.strictEqual(euler258(), 12747994);

Challenge Seed

function euler258() {
  // Good luck!
  return true;
}

euler258();

Solution

// solution required