OFFSET
1,4
COMMENTS
a(101) >= 3. See link to factordb.com. - Hugo Pfoertner, Aug 07 2019
LINKS
Yurii Ivanov, Table of n, a(n) for n = 1..103 (terms 1..100 from Sean A. Irvine and Hugo Pfoertner, term 101 from Tyler Busby)
Sean A. Irvine, Factorizations of (2^n-1)*n!+1
factordb.com, Status of (2^n-1)*n!+1.
FORMULA
MATHEMATICA
Table[PrimeOmega[(2^n-1)n!+1], {n, 90}] (* The program takes a long time to run. *) (* Harvey P. Dale, Feb 10 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Oct 09 2010
EXTENSIONS
More terms from Sean A. Irvine, Sep 15 2012
STATUS
approved