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 A140856 #9 Oct 30 2019 15:57:13 %S A140856 71,281,491,701,911,2381,2591,2801,3011,3221,3851,4271,4481,4691,5531, %T A140856 5741,6581,6791,7001,7211,7841,8681,9311,9521,9941,10151,10781,11411, %U A140856 11621,11831,12041,12251,12671,13721,13931,14561,14771,15401,16451 %N A140856 Primes of the form 210n+71. %t A140856 Select[71+210Range[0,150],PrimeQ] (* _Ray Chandler_, Apr 29 2010 *) %Y A140856 Cf. A073102. %K A140856 nonn %O A140856 1,1 %A A140856 _Juri-Stepan Gerasimov_, Jul 04 2008 %E A140856 Corrected and extended by _D. S. McNeil_, Dec 10 2009