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 A031369 #14 Sep 08 2022 08:44:50 %S A031369 3,11,19,31,43,59,71,83,101,109,131,149,163,179,193,211,229,241,263, %T A031369 277,293,313,337,353,373,389,409,431,443,461,479,499,521,547,569,587, %U A031369 601,617,641,653,673,691,719,739,757,773,809,823,839,859,881 %N A031369 a(n) = prime(3n-1). %H A031369 Ivan Panchenko, <a href="/A031369/b031369.txt">Table of n, a(n) for n = 1..1000</a> %t A031369 Prime[3*Range[60]-1] (* _Harvey P. Dale_, Jul 14 2012 *) %o A031369 (Magma) [ NthPrime(3*n-1): n in [1..1000] ]; // _Vincenzo Librandi_, Apr 11 2011 %K A031369 nonn %O A031369 1,1 %A A031369 _Jeff Burch_