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 A109071 #13 Feb 09 2020 11:39:19 %S A109071 2,8,19,31,37,64,68,71,79,85,89,94,100,109,128,136,137,148,149,157, %T A109071 170,178,179,181,184,190,194,211,215,233,241,250,251,269,277,284,290, %U A109071 293,298,304,310,313,314,316,317,326,331,353,355,367,370,376,386,394,400 %N A109071 Numbers k such that the string k123123 is prime. %C A109071 Also numbers k such that 10^6*k+123123 is prime. - _Stefan Steinerberger_, Mar 03 2006 %H A109071 Daniel Starodubtsev, <a href="/A109071/b109071.txt">Table of n, a(n) for n = 1..10000</a> %e A109071 If k=2 then k123123 = 2123123 (prime). %e A109071 If k=94 then k123123 = 94123123 (prime). %t A109071 Select[Range[0, 500], PrimeQ[10^6*# + 123123] &] (* _Stefan Steinerberger_, Mar 03 2006 *) %K A109071 nonn,base %O A109071 1,1 %A A109071 _Parthasarathy Nambi_, Aug 17 2005 %E A109071 More terms from _Stefan Steinerberger_, Mar 03 2006