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 A069634 #3 Dec 05 2013 19:55:16 %S A069634 7,71,271,2711,52711,5271107,95271107,9527110787,59527110787, %T A069634 5952711078773,65952711078773,6595271107877341,36595271107877341, %U A069634 3659527110787734161,33659527110787734161,3365952711078773416187 %N A069634 a(1) = 7; 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 A069634 Cf. A069614 to A069621, A069628 to A069636. %K A069634 nonn,base %O A069634 1,1 %A A069634 _Amarnath Murthy_, Mar 27 2002 %E A069634 Edited and extended by _Robert G. Wilson v_, Apr 03 2002