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A175703 Convolution of A007947 with itself. 0
1, 4, 10, 16, 27, 44, 72, 88, 105, 132, 194, 232, 259, 324, 464, 544, 593, 636, 862, 904, 999, 1092, 1500, 1576, 1689, 1852, 2210, 2192, 2307, 2460, 3184, 3256, 3613, 3596, 4830, 4304, 4455, 4860, 6220, 6264, 6193, 7372, 8314, 8560, 8047, 8724, 11076 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..47.

FORMULA

a(n) = Sum_{k=1..n} rad(k)*rad(n+1-k) where rad = A007947 is the product of the distinct prime factors of n.

MAPLE

read("transforms") ;

a007947 := [seq(A007947(n), n=1..60)]  ;

CONV(a007947, a007947) ; # R. J. Mathar, Nov 07 2011

CROSSREFS

Sequence in context: A076577 A008148 A089340 * A132227 A036063 A112984

Adjacent sequences:  A175700 A175701 A175702 * A175704 A175705 A175706

KEYWORD

nonn

AUTHOR

Michel Lagneau, Aug 10 2010

STATUS

approved

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Last modified May 25 18:25 EDT 2022. Contains 354071 sequences. (Running on oeis4.)