OFFSET
1,1
COMMENTS
The first composite is 45812984491. [Charles R Greathouse IV, Mar 20 2011]
MATHEMATICA
Select[4*Range[200000]+3, PowerMod[2, (2#-1)#-1, #(2#-1)]==1&] (* Harvey P. Dale, Mar 01 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Alzhekeyev Ascar M, Mar 16 2011
STATUS
approved