freeCodeCamp

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id	challengeType	title	forumTopicId
5900f3c81000cf542c50fedb	5	Problem 92: Square digit chains	302209

Description

A number chain is created by continuously adding the square of the digits in a number to form a new number until it has been seen before. For example, 44 → 32 → 13 → 10 → 1 → 1 85 → 89 → 145 → 42 → 20 → 4 → 16 → 37 → 58 → 89 Therefore any chain that arrives at 1 or 89 will become stuck in an endless loop. What is most amazing is that EVERY starting number will eventually arrive at 1 or 89. How many starting numbers below ten million will arrive at 89?

Instructions

Tests

tests:
  - text: <code>euler92()</code> should return 8581146.
    testString: assert.strictEqual(euler92(), 8581146);

Challenge Seed

function euler92() {
  // Good luck!
  return true;
}

euler92();

Solution

// solution required

1.1 KiB Raw Blame History