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 A340558 #5 Jan 11 2021 23:12:39 %S A340558 2,19,53,131,269,503,853,1361,1999,2879,3989 %N A340558 a(n) is the smallest prime that can be the apex of a triangle with n rows, all entries being distinct primes, and all row sums equal. %C A340558 A109724(n) is a lower bound for the sum of terms of triangle. %H A340558 Carlos Rivera, <a href="https://www.primepuzzles.net/puzzles/puzz_1026.htm">Puzzle 1026. Another pine-like-prime puzzle</a>, Prime Puzzles and Problems Connection. %e A340558 19 %e A340558 For n=2: 3 5 11 , so a(2) = 19. %Y A340558 Cf. A047837, A109724. %K A340558 nonn,more %O A340558 1,1 %A A340558 _Michel Marcus_, Jan 11 2021