OFFSET
4,1
LINKS
EXAMPLE
a(4)=8321 since 8321 is the largest 4-digit strong pseudoprime to base 2.
CROSSREFS
KEYWORD
hard,nonn,base
AUTHOR
Shyam Sunder Gupta, Feb 13 2002
EXTENSIONS
Edited by Charles R Greathouse IV, Nov 01 2009
a(16)-a(19) from Charles R Greathouse IV, Mar 14 2011
STATUS
approved