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 A318957 #13 Sep 29 2018 00:33:00 %S A318957 1,13,26,29,31,44,45,50,66,69,102,106,125,177,182,183,196,198,230,238, %T A318957 266,278,279,287,291,299,309,315,333,334,338,343,347,367,385,390,398, %U A318957 415,423,431,436,451,455,458,473,487,491,493,512,517,518,522,529,539,542,545,557,566,589 %N A318957 Numbers k such that A194113(k) is a prime. %e A318957 For k=1, A194113(1)=3; %e A318957 for k=13, A194113(13)=281; %e A318957 for k=26, A194113(26)=1097. %o A318957 (PARI) isok(n) = isprime(sum(k=1, n, floor(k*sqrt(10)))); \\ _Michel Marcus_, Sep 26 2018 %Y A318957 Cf. A194113. %K A318957 nonn %O A318957 1,2 %A A318957 _Marius A. Burtea_, Sep 24 2018