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 A162455 #18 Nov 24 2024 16:05:21
%S A162455 3,7,43,601,519121
%N A162455 Primes of the form (n!)^2 + (n!) + 1.
%C A162455 a(6) is associated with 76!=A000142(76)=A051856(7)! and has 223 decimal digits. - _R. J. Mathar_, _Emeric Deutsch_ and _Harvey P. Dale_, Jul 14 2009
%C A162455 a(6) =
%C A162455 355509027001074785420251313577077264819432566692554164797700525028005\
%C A162455 008417722668844213916658906516439209129303887999464691915088148300993\
%C A162455 913093163021697465163231343499013584682565554967153792311772997222400\
%C A162455 0000000000000001. - _N. J. A. Sloane_, Jul 11 2010
%F A162455 a(n) = A002061(A000142(A051856(n+1))+1). - _R. J. Mathar_, Jul 14 2009
%p A162455 a := proc (n) if isprime(factorial(n)^2+factorial(n)+1) = true then factorial(n)^2+factorial(n)+1 else end if end proc: seq(a(n), n = 1 .. 76); # _Emeric Deutsch_, Jul 21 2009
%t A162455 Select[Table[n!^2+n!+1,{n,150}],PrimeQ] (* _Harvey P. Dale_, Jul 23 2009 *)
%t A162455 Select[#^2+#+1&/@(Range[150]!),PrimeQ] (* _Harvey P. Dale_, Nov 24 2024 *)
%K A162455 nonn
%O A162455 1,1
%A A162455 _Daniel Tisdale_, Jul 03 2009