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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

Table of n, a(n) for n=1..50.

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 February 21 07:18 EST 2018. Contains 299390 sequences. (Running on oeis4.)