<section id="description">
<p>We say that a d-digit positive number (no leading zeros) is a one-child number if exactly one of its sub-strings is divisible by d.</p><p>For example, 5671 is a 4-digit one-child number. Among all its sub-strings 5, 6, 7, 1, 56, 67, 71, 567, 671 and 5671, only 56 is divisible by 4.
Similarly, 104 is a 3-digit one-child number because only 0 is divisible by 3.
1132451 is a 7-digit one-child number because only 245 is divisible by 7.</p>
<p>Let F(N) be the number of the one-child numbers less than N.
We can verify that F(10) = 9, F(103) = 389 and F(107) = 277674.</p>
<p>Find F(1019).</p>
</section>

function euler413() {
  // Good luck!
  return true;
}

euler413();


index

Проблема 413: номера одного ребенка

Problem 413: One-child Numbers

<code>euler413()</code> should return 3079418648040719.