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A100288 Primes of the form (1!)^2 + (2!)^2 + (3!)^2 +...+ (k!)^2. 6
5, 41, 617, 15017, 25935017, 1651637417, 13301522971817, 41117342095090841723228045851817, 2616218222822143606864564493635469851817 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Jonathan Vos Post contributed these numbers to Prime Curios.

LINKS

Table of n, a(n) for n=1..9.

G. L. Honaker, Jr. and C. Caldwell, Prime Curios!

EXAMPLE

41 = (1!)^2 + (2!)^2 + (3!)^2 is prime.

PROG

(PARI) lista(nn) = {my(s=1); for(k=2, nn, s+=(k!)^2; if(ispseudoprime(s), print1(s, ", "))); } \\ Jinyuan Wang, Mar 08 2020

CROSSREFS

Cf. A100289 (k such that (1!)^2 + (2!)^2 + (3!)^2 + ... + (k!)^2 is prime).

See also A061062, A104344.

Sequence in context: A246760 A073854 A104344 * A076094 A076131 A003719

Adjacent sequences:  A100285 A100286 A100287 * A100289 A100290 A100291

KEYWORD

nonn,fini

AUTHOR

T. D. Noe, Nov 11 2004

STATUS

approved

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Last modified December 4 18:29 EST 2020. Contains 338936 sequences. (Running on oeis4.)