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A097752
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Least integer with each "mod 4 prime signature".
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6
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1, 2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20, 21, 24, 25, 27, 30, 32, 36, 40, 42, 45, 48, 50, 54, 60, 63, 64, 65, 72, 75, 80, 81, 84, 90, 96, 100, 105, 108, 120, 125, 126, 128, 130, 135, 144, 150, 160, 162, 168, 180, 189, 192, 195, 200, 210, 216, 225, 231, 240, 243
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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See A097751 for definition of "mod 4 prime signature".
A097751 sorted and duplicates removed; n such that A097751(n)=n.
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LINKS
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Table of n, a(n) for n=1..63.
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MATHEMATICA
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mod4PrimeSignature[n_] := {fi = FactorInteger[n]; If[OddQ[n], 0, fi[[1, 2]]], Select[fi, Mod[#[[1]], 4] == 3 &][[All, 2]]//Sort, Select[fi, Mod[#[[1]], 4] == 1 &][[All, 2]]}; A097751[n_] := Catch[For[k = 2, True, k++, If[ mod4PrimeSignature[k] == mod4PrimeSignature[n], Throw[k]]]]; A097751[1] = 1; Select[ Range[243], A097751[#] == # &] (* Jean-François Alcover, Jan 10 2013 *)
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CROSSREFS
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Cf. A097751, A097753, A097754, A097755, A097756.
Sequence in context: A062849 A010432 A187041 * A014866 A051661 A051037
Adjacent sequences: A097749 A097750 A097751 * A097753 A097754 A097755
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KEYWORD
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nonn
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AUTHOR
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Ray Chandler, Aug 26 2004
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STATUS
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approved
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