--description--

How many 20 digit numbers $n$ (without any leading zero) exist such that no three consecutive digits of $n$ have a sum greater than 9?

--hints--

consecutiveDigitsSum() should return 378158756814587.

assert.strictEqual(consecutiveDigitsSum(), 378158756814587);

--seed--

--seed-contents--

function consecutiveDigitsSum() {

  return true;
}

consecutiveDigitsSum();

--solutions--

// solution required