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 A103890 #14 Jan 01 2025 03:44:39
%S A103890 2,2,5,25,17281,207361,696729601,12541132801,115880067072001,
%T A103890 1366643159020339200001,40999294770610176000001,
%U A103890 1854768736099424576471040000001,109950690675973888893203251200000001,4617929008390903333514536550400000001
%N A103890 a(n) = prime(n)! / prime(n)# + 1.
%H A103890 Reinhard Zumkeller, <a href="/A103890/a103890.txt">p(n)! / p(n)# + 1</a>.
%F A103890 a(n) = A039716(n)/A002110(n) + 1 = A092435(n) + 1.
%t A103890 #[[1]]/#[[2]]&/@With[{nn=15},Thread[{Prime[Range[nn]]!,FoldList[ Times,Prime[ Range[nn]]]}]]+1 (* _Harvey P. Dale_, May 21 2019 *)
%o A103890 (PARI) a(n) = prime(n)!/vecprod(primes(n)) + 1; \\ _Michel Marcus_, Nov 12 2023
%Y A103890 Cf. A103855, A103891, A103892, A103893, A103894, A103895, A103896.
%K A103890 nonn
%O A103890 1,1
%A A103890 _Reinhard Zumkeller_, Feb 20 2005