OFFSET
1,2
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Join[{1}, Select[Range[2000], PowerMod[23, #, #^2]==1&]] (* Harvey P. Dale, May 02 2015 *)
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Alexander Adamchuk, Mar 01 2007
STATUS
approved