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 A069681 #13 Jan 26 2023 14:33:37 %S A069681 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89, %T A069681 97,163,167,263,269,367,461,463,467,563,569,661,761,769,863,967,1663, %U A069681 1667,1669,2663,4663,5669,6661,7669,8663,8669,9661,16661,26669,46663,56663 %N A069681 Primes with either no internal digits or all internal digits are 6. %Y A069681 Cf. A069675, A069676, A069677, A069678, A069679, A069680, A069682, A069683, A069684. %K A069681 nonn,base %O A069681 1,1 %A A069681 _Amarnath Murthy_, Apr 06 2002 %E A069681 Corrected by _Ray Chandler_, Nov 24 2003 %E A069681 Offset corrected and name changed by _Arkadiusz Wesolowski_, Sep 07 2011