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 A138424 #15 Sep 08 2022 08:45:33
%S A138424 15,120,1560,8400,80520,185640,709920,1238040,3218160,10255560,
%T A138424 14314560,34671960,57928080,73504200,114672480,209097720,357462120,
%U A138424 422298120,675062520,902114640,1036535760,1538528160,1969520280,2792029680
%N A138424 a(n) = (prime(n)^5 - prime(n))/2.
%H A138424 Vincenzo Librandi, <a href="/A138424/b138424.txt">Table of n, a(n) for n = 1..200</a>
%F A138424 a(n) = A138404(n)/2. - _R. J. Mathar_, Oct 15 2017
%t A138424 a = {}; Do[p = Prime[n]; AppendTo[a, (p^5 - p)/2], {n, 1, 50}]; a
%t A138424 (#^5-#)/2&/@Prime[Range[30]] (* _Harvey P. Dale_, Oct 01 2017 *)
%o A138424 (Magma) [(NthPrime((n))^5 - NthPrime((n)))/2: n in [1..30] ]; // _Vincenzo Librandi_, Jun 18 2011
%o A138424 (PARI) forprime(p=2,1e3,print1((p^5-p)/2", ")) \\ _Charles R Greathouse IV_, Jul 15 2011
%K A138424 nonn,easy
%O A138424 1,1
%A A138424 _Artur Jasinski_, Mar 19 2008