OFFSET
0,1
COMMENTS
I came upon this sequence in an attempt to solve an open Erdős problem: Show that Sum_{k>=0} 1/(k!+1) is rational/irrational/transcendental.
LINKS
Harvey P. Dale, Table of n, a(n) for n = 0..43
FORMULA
a(n) = lcm_{k=0..n} (k! + 1).
MATHEMATICA
With[{t=Range[0, 20]!+1}, Table[LCM@@Take[t, n], {n, Length[t]}]] (* Harvey P. Dale, Dec 21 2015 *)
PROG
(PARI) a(n) = {lc = 1; for (k=0, n, lc = lcm(lc, k!+1); ); return (lc); } \\ Michel Marcus, Jul 25 2013
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Karl Levy, Mar 09 2008
EXTENSIONS
More terms from Harvey P. Dale, Dec 21 2015
STATUS
approved