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A176262
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Numbers of the form 3k+1 with greatest prime divisor of the form 3m-1.
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4
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4, 10, 16, 22, 25, 34, 40, 46, 55, 58, 64, 82, 85, 88, 94, 100, 106, 115, 118, 121, 136, 142, 145, 154, 160, 166, 178, 184, 187, 202, 205, 214, 220, 226, 232, 235, 238, 250, 253, 256, 262, 265, 274, 289, 295, 298, 319, 322, 328, 334, 340, 346, 352, 355, 358, 376
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OFFSET
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1,1
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COMMENTS
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All numbers of the form 2p, where p==2(mod 3) is prime, are in the sequence.
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LINKS
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MATHEMATICA
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Select[3 Range@ 120 + 1, Mod[#, 3] == 2 &[FactorInteger[#][[-1, 1]]] &] (* Michael De Vlieger, Feb 07 2016 *)
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PROG
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(PARI) isok(n) = ((n % 3) == 1) && (n != 1) && ((vecmax(factor(n)[, 1]) % 3) == 2); \\ Michel Marcus, Feb 07 2016
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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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STATUS
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approved
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