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# 13-rough numbers

From OeisWiki

Least prime factor ≥ 13.

## Sequences

A008365 13-rough numbers: positive integers that have no prime factors less than 13.

- {1, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 169, 173, 179, 181, 191, 193, 197, 199, 211, 221, 223, 227, 229, 233, 239, 241, 247, 251, 257, 263, 269, ...}

## See also

- Fifth row in an illustration for A002110, A005867, A038110, A060753.
- A084970 is the proper subset
*numbers with smallest prime factor 13*. -
*p*-rough numbers