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7-rough numbers
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Smallest prime factor (spf) is ≥ 7.
Sequences
7-rough numbers: positive integers that have no prime factors less than 7. (Cf. A007775)
- {1, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 77, 79, 83, 89, 91, 97, 101, 103, 107, 109, 113, 119, 121, 127, 131, 133, 137, 139, 143, 149, ...}
