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A063833 !n - 3 is prime. 1

%I

%S 1,4,5,6,13,14,20,66,91,124,212,282,460

%N !n - 3 is prime.

%C There are no further terms, because for n >= 467, 467 | !n - 3. - _Serge Batalov_, Jul 14 2017

%t Do[ If[ PrimeQ[ Sum[ k!, {k, 0, n - 1} ] - 3 ], Print[ n ] ], {n, 1, 800} ]

%t Position[Accumulate[Range[0,500]!],_?(PrimeQ[#-3]&)]//Flatten (* _Harvey P. Dale_, Sep 20 2019 *)

%Y Cf. A063508.

%K nonn,fini,full

%O 1,2

%A _Robert G. Wilson v_, Aug 21 2001

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Last modified February 28 11:08 EST 2020. Contains 332323 sequences. (Running on oeis4.)