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 A279400 #5 Jan 25 2017 08:39:51 %S A279400 3,3,4,5,6,6,7,7,7,10,9,9,9,10,10,10,12,12,13,13,13,14,14,14,14,16,17, %T A279400 16,15,17,17,16,18,19,19,19,18,20,20,21,21,21,21,22,22,22,22,22,23,23 %N A279400 Row lengths of the irregular triangle A279399. %C A279400 a(n) is the number of primes of the smallest positive restricted residue system modulo A033949(n). %Y A279400 Cf. A033949, A279399. %K A279400 nonn %O A279400 1,1 %A A279400 _Wolfdieter Lang_, Jan 25 2017