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 A068713 #14 Jan 10 2023 03:19:31 %S A068713 0,1,2,3,4,6,7,10,11,17,19,25,27,31,33,42,43,49,51,57,64,65,106,139, %T A068713 196,273,279,379,392,505,663,737,874,943,1015,1546,1547,1686,3937, %U A068713 4065,5164,6257,6401,7066,7412,7966,9440,9921,11105,15076,15547,22646,24779 %N A068713 Numbers k for which 10*2^k + 3 is a prime (giving terms of A068712). %t A068713 Select[Range[0,4100], PrimeQ[10*2^#+3] &] (* _Jayanta Basu_, May 22 2013 *) %Y A068713 Cf. A068712. %K A068713 nonn %O A068713 1,3 %A A068713 _Amarnath Murthy_, Mar 05 2002 %E A068713 More terms from _Sascha Kurz_, Mar 17 2002 %E A068713 Extended by _Charles R Greathouse IV_, Apr 24 2010 %E A068713 Offset 1 from _Michel Marcus_, Jan 10 2023