A175704 Auto-convolution of A008472.

0, 0, 4, 12, 17, 32, 54, 78, 95, 102, 149, 188, 213, 254, 360, 408, 463, 488, 617, 636, 769, 784, 1111, 1060, 1231, 1172, 1505, 1408, 1756, 1574, 1990, 2060, 2451, 2096, 3099, 2500, 2729, 2862, 3683, 3368, 4166, 3902, 4523, 4396, 4987, 4424, 6579, 5228

Offset: 1

Author

Michel Lagneau, Aug 10 2010

Keywords

• nonn

Comments

A008472 is the sum of the distinct primes dividing n.

Programs

Maple

A175704 := proc(n)
        add(A008472(k)*A008472(n+1-k),k=1..n) ;
end proc: # R. J. Mathar, Jul 10 2012

Formula

a(n) = Sum_{k=1..n} A008472(k)*A008472(n+1-k).