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 A133786 #6 May 20 2019 15:04:54 %S A133786 111,113,117,119,131,133,137,139,151,153,157,159,171,173,177,179,191, %T A133786 193,197,199,311,313,317,319,331,333,337,339,351,353,357,359,371,373, %U A133786 377,379,391,393,397,399,511,513,517,519,531,533,537,539,551,553,557 %N A133786 Numbers prime to 10, 10's digit is odd and 100's digit is odd. %H A133786 Robert Israel, <a href="/A133786/b133786.txt">Table of n, a(n) for n = 1..10000</a> %F A133786 a(n+20)=a(n)+200. - _Robert Israel_, May 20 2019 %p A133786 seq(seq(seq(seq(10^3*a+10^2*b+10*c+d, d=[1,3,7,9]),c=1..9,2),b=1..9,2),a=0..1); # _Robert Israel_, May 20 2019 %Y A133786 Cf. A045798. %K A133786 easy,nonn,base %O A133786 1,1 %A A133786 _Jonathan Vos Post_, Jan 02 2008