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 A141139 #34 Jan 24 2023 06:57:57
%S A141139 1,2,150,862,4210,6688,12496,15496,24420,40086,43206,67138,83046,
%T A141139 88426,102646,133998,161092,169986,202966,235288,243262,279816,305068,
%U A141139 346168,394812,438568,454500,481020,498936,521860,633160,670728,715698,741400
%N A141139 a(n) = f(f(f(f(f(n))))), where f(n) is prime(n)-1.
%p A141139 p:=ithprime: seq(p(p(p(p(p(n)-1)-1)-1)-1)-1, n=1..35); # _Emeric Deutsch_, Aug 06 2008
%t A141139 Table[Prime[Prime[Prime[Prime[Prime[n - 1] - 1] - 1] - 1] - 1] - 1, {n, 2, 50}] (* _Vincenzo Librandi_, Apr 05 2015 *)
%o A141139 (PARI) vector(50, n, prime(prime(prime(prime(prime(n)-1)-1)-1)-1)-1) \\ _Michel Marcus_, Apr 09 2015
%Y A141139 Cf. A006093, A140853, A141208, A141217.
%K A141139 nonn
%O A141139 1,2
%A A141139 _Juri-Stepan Gerasimov_, Jul 31 2008
%E A141139 More terms from _Emeric Deutsch_, Aug 06 2008