OFFSET
0,2
COMMENTS
LINKS
Maheswara Rao Valluri, Primes of the form p = 1 + n! Sum n, for some n ∈ N*, arXiv:1803.11461 [math.GM], 2018.
Simon Plouffe, Conjectures of the OEIS, as of June 20, 2018.
FORMULA
D-finite with recurrence n*a(n+1) = (n+1)*(n+2)*(a(n)-1) + n. - Chai Wah Wu, Apr 11 2018
E.g.f.: exp(x)-1/(x-1)^3*x. - Simon Plouffe, Jun 21 2018
MATHEMATICA
Array[# (# + 1)!/2 + 1 &, 22, 0] (* Michael De Vlieger, Apr 10 2018 *)
PROG
(PARI) apply( A300559=n->(n+1)!\2*n+1, [0..25])
(Magma) [n*Factorial(n+1)/2+1: n in [0..25]]; // Vincenzo Librandi, Apr 12 2018
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
M. F. Hasler, Apr 10 2018
STATUS
approved