Write it, run it, read the output

This is a scratch drill — your code runs, nothing is graded or recorded. No test cases, no expected output, no verdict.

TASK

Implement groupedRule so the program applies the same reusable divisibility rules to 27720. Print the divisors from 1 through 20 that divide it, confirming that 13, 16, 17, and 19 are omitted.

Divisors: 1 2 3 4 5 6 7 8 9 10 11 12 14 15 18 20
Omitted: 13 16 17 19