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A004620
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Divisible only by primes congruent to 2 mod 7.
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1
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1, 2, 4, 8, 16, 23, 32, 37, 46, 64, 74, 79, 92, 107, 128, 148, 149, 158, 163, 184, 191, 214, 233, 256, 296, 298, 316, 317, 326, 331, 359, 368, 373, 382, 401, 428, 443, 457, 466, 499, 512, 529, 541, 569, 592, 596
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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ok[1]=True; ok[n_]:=And@@(Mod[#, 7]==2&)/@FactorInteger[n][[All, 1]]; Select[Range[6000], ok] (* Vincenzo Librandi, Aug 20 2012 *)
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PROG
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(Magma) [n: n in [1..1000] | forall{d: d in PrimeDivisors(n) | d mod 7 eq 2}]; // Vincenzo Librandi, Aug 20 2012
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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