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%I #8 May 10 2019 22:34:40
%S 1,4,10,16,27,44,72,88,105,132,194,232,259,324,464,544,593,636,862,
%T 904,999,1092,1500,1576,1689,1852,2210,2192,2307,2460,3184,3256,3613,
%U 3596,4830,4304,4455,4860,6220,6264,6193,7372,8314,8560,8047,8724,11076
%N Convolution of A007947 with itself.
%F 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.
%p read("transforms") ;
%p a007947 := [seq(A007947(n),n=1..60)] ;
%p CONV(a007947,a007947) ; # _R. J. Mathar_, Nov 07 2011
%K nonn
%O 1,2
%A _Michel Lagneau_, Aug 10 2010
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