C-1 has (2^n) where n>=3 as a factor or (2^n*3^m) where n>=1 and m>=2 as a factor

Now, 10^5+3 as a PRP is prime because 10^5+2=2*3*166667,

not a Carmichael Number.

Also, 10^11+3 is prime because 10^11+2 = 2*3*7*1543*1543067,

also not a Carmichael Number.

Milton L. Brown

miltbrown AT earthlink.net