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A175317 a(n) = Sum_{d|n} 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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 5 12:51 EST 2020. Contains 338947 sequences. (Running on oeis4.)