freeCodeCamp/curriculum/challenges/english/08-coding-interview-prep/project-euler/problem-172-investigating-numbers-with-few-repeated-digits.english.md

id, challengeType, title, forumTopicId

id	challengeType	title	forumTopicId
5900f4181000cf542c50ff2b	5	Problem 172: Investigating numbers with few repeated digits	301807

Description

How many 18-digit numbers n (without leading zeros) are there such that no digit occurs more than three times in n?

Instructions

Tests

tests:
  - text: <code>euler172()</code> should return 227485267000992000.
    testString: assert.strictEqual(euler172(), 227485267000992000);

Challenge Seed

function euler172() {
  // Good luck!
  return true;
}

euler172();

Solution

// solution required