1,1
The smaller of the two prime factors is given in A083341. The next candidates for a continuation are 55 and 61. (55!)^2+1 is composite with 147 decimal digits and unknown factorization.
Table of n, a(n) for n=1..14.
Andrew Walker, Factors of (n!)^2+1.
a(1)=6 because (6!)^2+1=518401=13*39877 is a semiprime.
Cf. A020549, A001358, A083341, A046029.
Sequence in context: A209723 A066235 A037365 * A118733 A047275 A047590
Adjacent sequences: A083337 A083338 A083339 * A083341 A083342 A083343
nonn
Hugo Pfoertner, Apr 24 2003
approved
