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13-rough numbers

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13-rough numbers are integers having a least prime factor greater than or equal to 13. These are listed in A008365. The 13-rough numbers less than 100 are 1, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

See also