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 A090553 Sigma(A090552(n)). 1
 1, 3, 6, 12, 12, 24, 24, 24, 72, 72, 72, 72, 144, 144, 144, 144, 144, 288, 288, 288, 576, 576, 576, 576, 576, 576, 576, 576, 1152, 1152, 1152, 1152, 1152, 1152, 1152, 2304, 2304, 2304, 2304, 2304, 2304, 2304, 2304, 2304, 2304, 2304, 2304, 2304, 4608, 4608 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS FORMULA a(n) = A000203(A090552(n)). - Michel Marcus, Oct 12 2013 PROG (PARI) lista(nn) = {a = 1; print1(a, ", "); for (n = 1, nn, sa = sigma(a); a++; while (sigma(a) % sa, a++); print1(sigma(a), ", "); ); } \\ Michel Marcus, Oct 12 2013 CROSSREFS Cf. A007368, A090552. Sequence in context: A254793 A182633 A038587 * A078502 A107974 A298879 Adjacent sequences:  A090550 A090551 A090552 * A090554 A090555 A090556 KEYWORD nonn AUTHOR Amarnath Murthy, Dec 09 2003 EXTENSIONS Corrected and extended by David Wasserman, Jan 04 2006 STATUS approved

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Last modified January 23 13:09 EST 2019. Contains 319394 sequences. (Running on oeis4.)