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 A087389 #6 Dec 05 2013 19:56:21 %S A087389 3,31,131,1319,913103,3013193,39131033,3301319309,903913103341, %T A087389 14330131930927,729039131033419,9143301319309279,97290391310334191, %U A087389 1914330131930927929,929729039131033419149,94191433013193092792927 %N A087389 a(1) = 3; a(n+1) is the least prime formed by adding one or more digits to the digit reversal of a(n). %C A087389 Note that the digit reversal of a(6) is 3913103, which is already prime, but a(7) is required to have more digits than a(6). - _David Wasserman_, May 25 2005 %e A087389 a(2)= 31, a(3) is the smallest prime beginning with 31 and is 131. %Y A087389 Cf. A087388, A087390, A087391. %K A087389 base,nonn %O A087389 1,1 %A A087389 _Amarnath Murthy_, Sep 09 2003 %E A087389 More terms from _David Wasserman_, May 25 2005