13-rough numbers

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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

• 2-rough numbers
• 3-rough numbers
• 5-rough numbers
• 7-rough numbers
• 11-rough numbers
• 17-rough numbers
• 19-rough numbers
• 23-rough numbers