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 A075489 #18 Jun 27 2020 17:01:06
%S A075489 1,10,76,570,4784,43590,435004,4738392,55972218,713630736,9777359856,
%T A075489 143350864898,2240419421284,37194276947898,653800845663788,
%U A075489 12132997533521320,237076055569553246,4865738414759433466,104661156692004606078,2354571975178917773640
%N A075489 a(n) = prime((n+1)!) - prime(n!).
%F A075489 a(n) = A062439(n+1) - A062439(n). - _Jinyuan Wang_, Jun 27 2020
%e A075489 n=5: a(5) = prime(720) - prime(120) = 5443 - 659 = 4784.
%t A075489 Table[Prime[(n + 1)! ] - Prime[n! ], {n, 1, 10}] (* _Stefan Steinerberger_, Apr 10 2006 *)
%t A075489 #[[2]]-#[[1]]&/@Partition[Prime/@(Range[15]!),2,1](* _Harvey P. Dale_, Jul 07 2019 *)
%Y A075489 Cf. A000040, A000142, A062439.
%K A075489 nonn,more
%O A075489 1,2
%A A075489 _Labos Elemer_, Sep 26 2002
%E A075489 Definition corrected by _Stefan Steinerberger_, Apr 10 2006
%E A075489 a(15)-a(18) from _Giovanni Resta_, Jul 08 2019
%E A075489 a(19)-a(20) from _Jinyuan Wang_, Jun 27 2020