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 A064508 #7 Oct 20 2013 02:58:08 %S A064508 43,61,67,367,409,12433,23557,38201,80803,82421,99907,117127,294223, %T A064508 305611,329677,371359,420001,476407,649639,669133,852851,860257, %U A064508 929293,1531813,1565209,1634203,2673343,3539359,4386887,5209999,5661613 %N A064508 Prime numbers generated by casting a number in its own base. %e A064508 E.g. 21 in base 21 becomes 43. %Y A064508 Cf. A064507. %K A064508 nonn,base %O A064508 1,1 %A A064508 _Jon Perry_, Oct 06 2001 %E A064508 Offset corrected by _Arkadiusz Wesolowski_, Oct 19 2013