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Partial sums of A094837.
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%I #11 Jul 09 2017 03:53:11

%S 1,3,7,17,41,87,187,412,937,2162,5298,12354,29994,74094,182994,444354,

%T 1081419,2737788,6745792,16765802,41815827,105943891,261683475,

%U 655537299,1668304275

%N Partial sums of A094837.

%C 3, 7, 17, 41, 937 and 105943891 are primes.

%e a(12) = 1 + 2 + 4 + 10 + 24 + 46 + 100 + 225 + 525 + 1225 + 3136 + 7056 = 12354.

%Y Cf. A094837.

%K nonn

%O 1,2

%A _Jonathan Vos Post_, May 16 2008

%E a(4)=17 added and a(13)-a(25) from _Akshay Bansal_, Jul 08 2017