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 A031904 #17 Aug 10 2025 10:33:10 %S A031904 11,43,83,131,179,229,277,337,389,443,499,569,617,673,739,809,859,929, %T A031904 991,1049,1103,1181,1237,1301,1381,1451,1499,1571,1621,1699,1777,1861, %U A031904 1913,1997,2063,2129,2207,2273,2341,2393,2467,2551,2647 %N A031904 a(n) = prime(9*n - 4). %t A031904 Prime[9 Range[50]-4] (* _Harvey P. Dale_, Mar 15 2023 *) %o A031904 (Magma) [ NthPrime(9*n-4): n in [1..50] ]; // _Vincenzo Librandi_, Apr 09 2011 %Y A031904 Cf. A017221. %K A031904 nonn %O A031904 1,1 %A A031904 _Jeff Burch_