%I #10 Apr 09 2014 10:14:06
%S 2,5,16,29,256,563,1024,1487,4096,6779,65536,124367,262144,400151,
%T 17179869184,34359339617,274877906944,515396474423,
%U 19807040628566084398385987584,39614081257132168281375501017,324518553658426726783156020576256,648997493235596321398030665669353
%N a(n) = sum{k=0 to n} A139021(k).
%C By definition, every term is a power of a prime.
%C For all n >= 0, a(2n) = 2^m, m >= 1.
%Y Cf. A139020, A139021.
%K nonn
%O 0,1
%A _Leroy Quet_, Apr 06 2008
%E a(5)-a(19) from _Donovan Johnson_, Nov 26 2008
%E a(20)-a(21) from _Max Alekseyev_, Oct 14 2012