New puzzle: lucky numbers inspired by codeforces 122A #10
Description
def sat(d: int, n=6002685529): """ Find a integer factor of n whose decimal representation consists only of 7's and 4's. Inspired by [Codeforces Problem 122 A](https://codeforces.com/problemset/problem/122/A) """ return n % d == 0 and set(str(d)) <= {"4", "7"}Solvers, post your solutions in the comments using the following formatting:
<details><summary>Reveal solution</summary> ```python def sol(): return "world" # replace with your solution ``` </details>