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 A108130 #10 Dec 27 2022 09:02:27 %S A108130 2,3,5,6,7,9,12,13,15,16,17,21,24,25,29,30,32,34,35,38,40,47,48,52,53, %T A108130 54,56,57,58,70,73,75,79,84,85,87,94,95,97,98,101,103,108,109,113,114, %U A108130 117,119,120,121,131,134,136,146,155,157,165,166,167,179,180 %N A108130 Partial sums of A108129. %o A108130 (PARI) f(n) = my(k=2*n-1, m=1); while(!isprime(k*2^m-1), m++); m; \\ A108129 %o A108130 a(n) = sum(k=1, n, a(k)); %Y A108130 Cf. A108129. %K A108130 nonn %O A108130 1,1 %A A108130 _Jorge Coveiro_, Jun 04 2005 %E A108130 a(14) and following corrected by _Georg Fischer_, Dec 26 2022 %E A108130 Offset 1 from _Michel Marcus_, Dec 26 2022