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 A178835 #9 Sep 08 2022 08:45:54 %S A178835 37,151,607,39845887,41781441855487,10696049115004927, %T A178835 11760430373211112611541680127, %U A178835 206891679087930585785731761318515072565247,52964269846510229961147330897539858576703487,888592995497188974267840378291500075950806986129407 %N A178835 Primes of the form 19 * 2^n - 1. %C A178835 Main entry for this sequence is A001775. %C A178835 Also primes of the form 38 * 4^n - 1, since even-numbered exponents yield numbers divisible by three. %H A178835 Vincenzo Librandi, <a href="/A178835/b178835.txt">Table of n, a(n) for n = 1..20</a> %t A178835 Select[19*2^Range[140]-1,PrimeQ] (* _Harvey P. Dale_, Mar 07 2014 *) %o A178835 (Magma) [a: n in [0..250] | IsPrime(a) where a is (19 * 2^n - 1)]; // _Vincenzo Librandi_, Mar 08 2014 %K A178835 nonn %O A178835 1,1 %A A178835 Kevin Batista (kevin762401(AT)yahoo.com), Jun 16 2010 %E A178835 Edited by _Charles R Greathouse IV_, Aug 29 2010 %E A178835 Edited by _Charles R Greathouse IV_, Sep 02 2010 %E A178835 More terms from _Harvey P. Dale_, Mar 07 2014