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 A030006 #18 Jul 08 2025 19:26:38
%S A030006 0,1,5,8,16,21,33,56,65,96,120,133,161,208,261,280,341,385,408,481,
%T A030006 533,616,736,800,833,901,936,1008,1281,1365,1496,1541,1776,1825,1976,
%U A030006 2133,2241,2408,2581,2640,2945,3008,3136,3201,3605,4033,4181,4256,4408,4641
%N A030006 a(n) = (prime(n)-1)*(prime(n)-5)/12.
%C A030006 Confirmed a(n) = A242090(n) for 3 <= n <= 4000. - _Fausto A. C. Cariboni_, Feb 23 2019
%H A030006 T. D. Noe, <a href="/A030006/b030006.txt">Table of n, a(n) for n = 3..1000</a>
%t A030006 Table[(p - 1) (p - 5)/12, {p, Prime[Range[3, 50]]}] (* _T. D. Noe_, Apr 16 2012 *)
%t A030006 ((#-1)(#-5))/12&/@Prime[Range[3,60]] (* _Harvey P. Dale_, Aug 13 2023 *)
%Y A030006 Cf. A000040.
%K A030006 nonn
%O A030006 3,3
%A A030006 _N. J. A. Sloane_