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 A137848 #18 Jun 13 2017 10:19:33 %S A137848 2,6,8,17,22,39,89,143,167,312,334,357,414,2254,2694,24094,42081,78632 %N A137848 Numbers k such that 10^k + 81 is prime. %C A137848 The next term, if one exists, is >100000. - _Robert Price_, Apr 25 2011 %e A137848 10^2+81=100+81=181 is prime %t A137848 Select[10^Range[25000] + 81, PrimeQ] (* _Alonso del Arte_, Dec 27 2010 *) %o A137848 (PARI) is(n)=ispseudoprime(10^n+81) \\ _Charles R Greathouse IV_, Jun 13 2017 %K A137848 nonn %O A137848 1,1 %A A137848 _Vladimir Joseph Stephan Orlovsky_, May 06 2008 %E A137848 Added three terms: 2254,2694,24094. _Robert Price_, Oct 09 2010 %E A137848 a(17)=42081 from _Robert Price_, Dec 27 2010 %E A137848 a(18)=78632 from _Robert Price_, Mar 03 2011