A175703 Convolution of A007947 with itself.

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

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