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 A261449 #13 Aug 22 2015 06:03:27
%S A261449 83,109,149,181,199,269,281,283,349,383,401,419,439,443,461,463,467,
%T A261449 479,491,509,569,587,599,601,607,619,641,643,647,659,661,691,709,769,
%U A261449 787,811,821,823,827,853,857,877,907,919,929,941,947,967,991,997,1019,1039
%N A261449 Prime numbers whose decimal digits contain a total of two loops.
%C A261449 Of the digits, 0 through 9, {0, 4, 6, 9} have one loop, 8 has two loops, and all the rest have none. - _Robert G. Wilson v_, Aug 20 2015
%e A261449 83 is the first term of the sequence. The digit 8 contains two closed curves.
%t A261449 Select[Prime@ Range@ 200, 2 == Total[{ 1,0, 0,0, 1,0, 1,0, 2,1}[[1 + IntegerDigits@ #]]]&] (* _Giovanni Resta_, Aug 19 2015 *)
%Y A261449 Cf. A001729, A190222, A001743, A001744, A001745, A249572.
%K A261449 nonn,less,easy,base
%O A261449 1,1
%A A261449 _Altug Alkan_, Aug 19 2015
%E A261449 More terms from _Giovanni Resta_, Aug 19 2015