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 A154619 #10 Jan 12 2019 20:08:13
%S A154619 23,71,167,191,479,743,1583,2039,2927,3863,5711,6551,7919,9767,10487,
%T A154619 11423,15791,16703,18119,21647,21911,24359,27527,32159,35111,35447,
%U A154619 38543,43991,45887,46271,52223,54287,55967,60719,67511,69383,76631
%N A154619 Primes of the form (4k^2 + 4k - 5)/5.
%C A154619 The numbers k that generate integers of the form (4k^2 + 4k - 5)/5 are in A047208. The primes are generated by the subset k = 5, 9, 14, 15, 24, 30, ... of these. - _R. J. Mathar_, Jan 25 2009
%H A154619 Vincenzo Librandi, <a href="/A154619/b154619.txt">Table of n, a(n) for n = 1..1000</a>
%p A154619 a := proc (n) if type((4/5)*n^2+(4/5)*n-1, integer) = true and isprime((4/5)*n^2+(4/5)*n-1) = true then (4/5)*n^2+(4/5)*n-1 else end if end proc: seq(a(n), n = 1 .. 340); # _Emeric Deutsch_, Jan 21 2009
%t A154619 Select[Table[(4n^2+4n-5)/5,{n,3,200}],PrimeQ] (* _Vincenzo Librandi_, Jul 23 2012 *)
%Y A154619 Cf. A028880.
%K A154619 nonn,easy
%O A154619 1,1
%A A154619 _Vincenzo Librandi_, Jan 16 2009
%E A154619 Definition corrected and more terms from _R. J. Mathar_ and _Omar E. Pol_, Jan 24 2009
%E A154619 Extended by _Emeric Deutsch_, Jan 21 2009