A090553 Sigma(A090552(n)).

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

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: A353715 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