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 A136366 #17 Jun 06 2021 15:55:37
%S A136366 3,4,5,10,21,31,55,77,121,135,148,192,425,570,612,649,1293,2326,3646
%N A136366 Numbers k such that A024530(k) is prime.
%t A136366 f=0; Do[ p=Prime[n]; f=f + (-1)^(n+1)*1/p; g=Numerator[f] ;If[ PrimeQ[g], Print[ {n, g} ] ], {n, 1, 150} ]
%Y A136366 Cf. A024530 (numerator of Sum_{k=1..n} (-1)^k / prime(k)).
%Y A136366 Cf. A136365, A136367, A136368, A136369, A136370, A136371.
%K A136366 nonn,more
%O A136366 1,1
%A A136366 _Alexander Adamchuk_, Dec 27 2007
%E A136366 a(12)-a(16) from _Alexander Adamchuk_, Sep 15 2010
%E A136366 a(17)-a(19) from _Robert Price_, Aug 27 2019