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 A174153 #19 Jul 07 2024 13:20:47 %S A174153 2,8,10,64,76,118,120,258,303,332,364,528,811,1270,1362,1607,2091, %T A174153 2572,3596,8190,34271,37860,37938 %N A174153 Numbers k such that 2*13^k - 1 is prime. %C A174153 a(21) > 14400. - _Jinyuan Wang_, Feb 26 2020 %t A174153 Select[Range[5000], PrimeQ[(2 13^# - 1)] &] (* _Vincenzo Librandi_, Oct 05 2012 *) %o A174153 (Magma) /* The code gives only the terms up to 1607: */ [n: n in [0..1700] | IsPrime(2*13^n-1)]; %o A174153 (PARI) is(n)=ispseudoprime(2*13^n-1) \\ _Charles R Greathouse IV_, Jun 13 2017 %K A174153 nonn,more %O A174153 1,1 %A A174153 _Vincenzo Librandi_, Mar 10 2010 %E A174153 a(14)-a(19) from _Vincenzo Librandi_, Oct 05 2012 %E A174153 a(20) from _Jinyuan Wang_, Feb 26 2020 %E A174153 a(21)-a(23) from _Michael S. Branicky_, Jul 07 2024