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A175318 a(n) = Sum_{k<=n} A007955(k), where A007955(m) = product of divisors of m. 0
1, 3, 6, 14, 19, 55, 62, 126, 153, 253, 264, 1992, 2005, 2201, 2426, 3450, 3467, 9299, 9318, 17318, 17759, 18243, 18266, 350042, 350167, 350843, 351572, 373524, 373553, 1183553, 1183584, 1216352, 1217441, 1218597, 1219822, 11297518, 11297555, 11298999, 11300520 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..39.

EXAMPLE

For n = 4, with b(n) = A007955(n), a(4) = b(1)+b(2)+b(3)+b(4) = 1+2+3+8 = 14.

PROG

(PARI) prd(n) = my(dn = divisors(n)); prod(i=1, #dn, dn[i]);

a(n) = sum(k=1, n, prd(k)); \\ Michel Marcus, Dec 09 2014

CROSSREFS

Cf. A007955.

Sequence in context: A263620 A083356 A096337 * A281025 A109757 A075189

Adjacent sequences:  A175315 A175316 A175317 * A175319 A175320 A175321

KEYWORD

nonn

AUTHOR

Jaroslav Krizek, Apr 01 2010

EXTENSIONS

Edited and more terms from Michel Marcus, Dec 09 2014

STATUS

approved

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Last modified June 21 10:09 EDT 2021. Contains 345360 sequences. (Running on oeis4.)