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 A157417 #8 Sep 08 2022 08:45:42
%S A157417 7,17,29,43,61,103,157,257,337,641,701,829,967,1117,1277,1361,1447,
%T A157417 1723,2129,2237,2347,3067,3329,3463,4177,4327,4481,4637,4957,5981,
%U A157417 6343,6529,6907,7297,7901,8317,9181,9403,9629,9857,10321,11527,11777,12541,13063
%N A157417 Primes of the form floor((4*n^2-8*n-9)/3).
%C A157417 Added in order to clarify A154616.
%H A157417 Vincenzo Librandi, <a href="/A157417/b157417.txt">Table of n, a(n) for n = 1..1000</a>
%t A157417 Select[Table[Floor[(4 n^2 - 8 n - 9)/3], {n, 3, 100}], PrimeQ] (* _Vincenzo Librandi_, Mar 21 2013 *)
%o A157417 (Magma) [a: n in [3..100] | IsPrime(a) where a is Floor((4*n^2-8*n-9)/3)]; // _Vincenzo Librandi_, Mar 21 2013
%K A157417 nonn,easy
%O A157417 1,1
%A A157417 _N. J. A. Sloane_, Jun 25 2010