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 A215509 Numerator of sigma(n)/n when n belongs to A162657. 1
 1, 3, 4, 7, 6, 13, 8, 15, 13, 21, 12, 31, 14, 31, 26, 31, 18, 49, 20, 63, 32, 45, 24, 65, 31, 49, 40, 57, 30, 91, 32, 63, 52, 63, 48, 91, 38, 75, 56, 93, 42, 127, 44, 93, 121, 93, 48, 127, 57, 93, 80, 105, 54, 121, 72, 127, 80, 105, 60, 217, 62, 127, 104 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS When p is prime, A162657(p)=p so a(p)=p+1. LINKS Michel Marcus, Table of n, a(n) for n = 1..1000 EXAMPLE A162657(2) = 2, so a(2)=numerator(sigma(2)/2)=numerator(3/2)=3. CROSSREFS Equal to or greater than A214409. Sequence in context: A324054 A214413 A214409 * A053480 A258052 A344484 Adjacent sequences: A215506 A215507 A215508 * A215510 A215511 A215512 KEYWORD nonn AUTHOR Michel Marcus, Aug 14 2012 STATUS approved

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Last modified February 21 03:52 EST 2024. Contains 370219 sequences. (Running on oeis4.)