

A175317


a(n) = Sum_{dn} A007955(d) where A007955(m) = product of divisors of m.


6



1, 3, 4, 11, 6, 42, 8, 75, 31, 108, 12, 1778, 14, 206, 234, 1099, 18, 5901, 20, 8116, 452, 498, 24, 333618, 131, 692, 760, 22166, 30, 810372, 32, 33867, 1104, 1176, 1238, 10085333, 38, 1466, 1538, 2568180, 42, 3112382, 44, 85690, 91386, 2142, 48, 255138610
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..48.


EXAMPLE

For n = 4, with b(n) = A007955(n), a(4) = b(1) + b(2) + b(4) = 1 + 2 + 8 = 11.


PROG

(PARI) prd(n) = dn = divisors(n); prod(i=1, #dn, dn[i]);
a(n) = sumdiv(n, d, prd(d)); \\ Michel Marcus, Dec 09 2014


CROSSREFS

Sequence in context: A328851 A197953 A198299 * A056045 A220848 A232891
Adjacent sequences: A175314 A175315 A175316 * A175318 A175319 A175320


KEYWORD

nonn


AUTHOR

Jaroslav Krizek, Apr 01 2010


EXTENSIONS

Corrected by Jaroslav Krizek, Apr 02 2010
Edited and more terms from Michel Marcus, Dec 09 2014


STATUS

approved



