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 A069633 #3 Dec 05 2013 19:55:16 %S A069633 6,61,461,46103,546103,5461031,55461031,554610311,12554610311, %T A069633 125546103119,17125546103119,1712554610311907,81712554610311907, %U A069633 8171255461031190733,108171255461031190733,10817125546103119073317 %N A069633 a(1) = 6; a(2n) = smallest prime starting (most significant digits) with a(2n-1). a(2n+1) = smallest prime ending (least significant digits)in a(2n). %Y A069633 Cf. A069614 to A069621, A069628 to A069636. %K A069633 nonn,base %O A069633 1,1 %A A069633 _Amarnath Murthy_, Mar 27 2002 %E A069633 Edited and extended by _Robert G. Wilson v_, Apr 03 2002