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A336554
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Odd numbers k such that rad(k) divides sigma(k).
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3
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1, 135, 891, 1521, 3375, 5733, 10935, 11907, 41067, 43875, 84375, 89667, 92781, 98865, 107811, 108927, 154791, 185625, 200655, 216513, 226233, 273375, 274625, 287469, 307125, 336141, 416745, 448335, 480249, 544635, 557375, 570375, 590625, 627669, 628849, 648675, 692055, 823875, 885735, 931095, 968877, 1071875, 1108809, 1131165
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OFFSET
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1,2
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COMMENTS
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Only a minority of terms seem to be also in A228058: 5733, 92781, 2069613, 3341637, 4179357, 5929605, 60998353, 67637349, 89162541 among the first 216, the five of them which occur also in A263983.
Question: Is the intersection with A336553 empty?
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LINKS
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PROG
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(PARI) isA336554(n) = if(!(n%2), 0, !(sigma(n) % factorback(factorint(n)[, 1])));
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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