OFFSET
1,3
COMMENTS
Computed up to n = 94 by David Broadhurst, and independently up to n = 67 by Hans Havermann and M. F. Hasler.
At n = 95 and n = 96 we have composite factors of 157 digits with probably no divisor less than 50 digits. - David Broadhurst, Oct 17 2015
LINKS
David Broadhurst, Table of n, a(n) for n = 1..94
Hans Havermann and David Broadhurst, Crandall Numbers Factored
PROG
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
M. F. Hasler, Oct 17 2015
STATUS
approved