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 A075599 #10 Feb 26 2025 22:18:22 %S A075599 7,173,11731,2117317,421173173,34211731733,1342117317337, %T A075599 813421173173377,28134211731733771,4281342117317337713, %U A075599 142813421173173377131,21428134211731733771317,2214281342117317337713171,2022142813421173173377131711,1120221428134211731733771317111 %N A075599 a(1) = 7 and then the smallest prime that is obtained by placing digits on both sides of the previous term. Or smallest prime that encompasses a(n-1). %Y A075599 Cf. A075595, A075596, A075597, A075598, A075600, A075601, A075602. %K A075599 base,nonn %O A075599 1,1 %A A075599 _Amarnath Murthy_, Sep 28 2002 %E A075599 More terms from _Sascha Kurz_, Jan 20 2003 %E A075599 Further terms from _Ray G. Opao_, Nov 26 2004 %E A075599 a(14)-a(15) corrected by _Sean A. Irvine_, Feb 26 2025