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A071822
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Numbers whose largest prime factor is of the form 4k+3.
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1
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3, 6, 7, 9, 11, 12, 14, 18, 19, 21, 22, 23, 24, 27, 28, 31, 33, 35, 36, 38, 42, 43, 44, 46, 47, 48, 49, 54, 55, 56, 57, 59, 62, 63, 66, 67, 69, 70, 71, 72, 76, 77, 79, 81, 83, 84, 86, 88, 92, 93, 94, 95, 96, 98, 99, 103, 105, 107, 108, 110, 112, 114, 115, 118, 121, 124
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listen;
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OFFSET
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1,1
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LINKS
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Amiram Eldar, Table of n, a(n) for n = 1..10000
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FORMULA
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Numbers k such that A006530(k) == 3 (mod 4).
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MATHEMATICA
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Select[Range[125], Mod[FactorInteger[#][[-1, 1]], 4] == 3 &] (* Amiram Eldar, May 04 2022 *)
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PROG
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(PARI) for(n=2, 200, if((component(component(factor(n), 1), omega(n))-3)%4==0, print1(n, ", ")))
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CROSSREFS
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Cf. A004767, A006530, A071821.
Sequence in context: A187811 A324696 A186348 * A268380 A268378 A221264
Adjacent sequences: A071819 A071820 A071821 * A071823 A071824 A071825
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KEYWORD
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easy,nonn
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AUTHOR
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Benoit Cloitre, Jun 07 2002
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STATUS
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approved
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