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A008365
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Smallest prime factor is >= 13.
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6
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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Also the 13-rough numbers: positive integers that have no prime factors less than 13 [From Michael Porter (michael_b_porter(AT)yahoo.com), Oct 10 2009]
Conjecture: Numbers n such that n^24 is congruent to {1,421,631,841} mod 2310. [From Gary Detlefs, Dec 30 2011]
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LINKS
| Eric Weisstein's World of Mathematics, Rough Number
Index entries for sequences related to smooth numbers [From Michael Porter (michael_b_porter(AT)yahoo.com), Oct 10 2009]
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MAPLE
| for i from 1 to 500 do if gcd(i, 2310) = 1 then print(i); fi; od;
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MATHEMATICA
| Select[ Range[ 300 ], GCD[ #1, 2310 ]==1& ]
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PROG
| (PARI) isA008365(n) = gcd(n, 2310)==1 [From Michael Porter (michael_b_porter(AT)yahoo.com), Oct 10 2009]
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CROSSREFS
| For k-rough numbers with other values of k, see A000027 A005408 A007310 A007775 A008364 A008365 A008366 A166061 A166063 [From Michael Porter (michael_b_porter(AT)yahoo.com), Oct 10 2009]
Sequence in context: A052055 A075761 A046064 * A132077 A034845 A045921
Adjacent sequences: A008362 A008363 A008364 * A008366 A008367 A008368
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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