This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A172297 #12 Jul 22 2025 04:06:13
%S A172297 2,5,11,41,116,197,312,435,684,1046,1430,1892,2404,3155,3977,9289,
%T A172297 17044,26575,38954,54776,73661,96632,119637,218363,361381,512404,
%U A172297 1179475,2374678,3643657,5111420,7125412,9493318,13246266,30262868
%N A172297 Partial sums of A002234.
%C A172297 The subsequence of primes in this sequence begins: 2, 5, 11, 41, 197, 218363, 3643657.
%F A172297 a(n) = Sum_{i=1..n} {i such that the Woodall number i*2^i - 1 is prime}.
%e A172297 a(6) = 2 + 3 + 6 + 30 + 75 + 81 = 197.
%Y A172297 Cf. A000040, A002234, A050918.
%K A172297 nonn,hard,more,less
%O A172297 1,1
%A A172297 _Jonathan Vos Post_, Jan 30 2010
%E A172297 a(34) added from the data at A002234 by _Amiram Eldar_, Jul 22 2025