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 A104044 #16 Jan 03 2021 08:36:06 %S A104044 0,10,30,60,90,130,160,190,220,270,330,340,360,390,400,450,510,540, %T A104044 550,580,600,660,690,720,730,750,760,790,870,880,900,990,1000,1060, %U A104044 1180,1200,1210,1290,1300,1380,1390,1410,1420,1440,1510 %N A104044 Numbers k such that 10*k + 7 is prime and k is a multiple of ten. %e A104044 If t=10, then 10*t + 7 = 107 (prime). %e A104044 If t=220, then 10*t + 7 = 2207 (prime). %e A104044 If t=450, then 10*t + 7 = 4507 (prime). %t A104044 Select[10 Range[0,500],PrimeQ[10#+7]&] (* _Harvey P. Dale_, Dec 09 2010 *) %K A104044 base,nonn %O A104044 1,2 %A A104044 _Parthasarathy Nambi_, Mar 01 2005 %E A104044 More terms from _Harvey P. Dale_, Dec 09 2010 %E A104044 a(1)=0 inserted by _Georg Fischer_, Jan 03 2021