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 A209189 #6 Dec 22 2024 12:21:00
%S A209189 7,13,3,31,43,3,73,7,3,7,157,3,211,241,3,307,7,3,421,463,3,7,601,3,19,
%T A209189 757,3,13,7,3,7,1123,3,13,31,3,1483,7,3,1723,13,3,7,19,3,37,13,3,2551
%N A209189 Smallest prime factor of n^2 + n + 1.
%H A209189 PrimeFan, <a href="http://primefan.tripod.com/EsotericIntegerSequences.html">Listing of Esoteric Integer Sequences</a>
%H A209189 PrimeFan, <a href="/A031214/a031214.pdf">Esoteric Integer Sequences</a> [Cached copy]
%t A209189 Flatten[Table[SPF[n^2 + (n + 1)], {n, 2, 50}]]
%K A209189 nonn
%O A209189 2,1
%A A209189 _N. J. A. Sloane_, Mar 05 2012