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 A138417 #17 Sep 08 2022 08:45:33
%S A138417 7,39,310,1197,7315,14274,41752,65151,139909,353626,461745,937062,
%T A138417 1412860,1709379,2439817,3945214,6058651,6922890,10075527,12705805,
%U A138417 14199084,19475001,23729119,31371076,44264592,52030150,56275389
%N A138417 a(n) = (prime(n)^4 - prime(n))/2.
%H A138417 Vincenzo Librandi, <a href="/A138417/b138417.txt">Table of n, a(n) for n = 1..200</a>
%F A138417 a(n) = A138401(n)/2. - _R. J. Mathar_, Oct 15 2017
%t A138417 a = {}; Do[p = Prime[n]; AppendTo[a, (p^4 - p)/2], {n, 1, 50}]; a
%t A138417 (#^4-#)/2&/@Prime[Range[50]] (* _Harvey P. Dale_, Mar 21 2011 *)
%o A138417 (Magma) [(NthPrime((n))^4 - NthPrime((n)))/2: n in [1..30] ]; // _Vincenzo Librandi_, Jun 17 2011
%o A138417 (PARI) forprime(p=2,1e3,print1((p^4-p)/2", ")) \\ _Charles R Greathouse IV_, Jul 15 2011
%K A138417 nonn,easy
%O A138417 1,1
%A A138417 _Artur Jasinski_, Mar 19 2008