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A038512
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Nonprime numbers with smallest prime factor >= 13.
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3
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169, 221, 247, 289, 299, 323, 361, 377, 391, 403, 437, 481, 493, 527, 529, 533, 551, 559, 589, 611, 629, 667, 689, 697, 703, 713, 731, 767, 779, 793, 799, 817, 841, 851, 871, 893, 899, 901, 923, 943, 949, 961, 989, 1003, 1007, 1027, 1037, 1073, 1079
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OFFSET
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1,1
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COMMENTS
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Composite numbers k such that k^120 mod 2310 = 1. - Gary Detlefs, May 02 2012
The asymptotic density of this sequence is 16/77. - Amiram Eldar, Mar 22 2021
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LINKS
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MAPLE
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for n from 1 to 1079 do if n^120 mod 2310=1 then print(n) fi od; # Gary Detlefs, May 02 2012
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MATHEMATICA
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Select[Range[1000], ! PrimeQ[#] && FactorInteger[#][[1, 1]] >= 13 &] (* T. D. Noe, Mar 16 2013 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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923=13*71 added by Howard Berman (howard_berman(AT)hotmail.com), Jan 22 2010
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STATUS
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approved
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