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 A273757 #10 Jun 17 2016 00:14:06 %S A273757 7,13,31,37,31,73,79,103,103,109,103,193,139,181,211,193,331,373,349, %T A273757 421,541,421,439,601,883,613,673,769,883,631,1153,787,739,733,1063, %U A273757 1033,1291,1279,853,1009,1801,1231,1951,1153,1531,1453,997,1693 %N A273757 Least prime factor of A272935(n). %e A273757 a(1) = 7 because A272935(1) = 1729 and 1729 = 7*13*19. %Y A273757 Cf. A020639, A272935. %K A273757 nonn %O A273757 1,1 %A A273757 _Altug Alkan_, May 29 2016