OFFSET
1,1
LINKS
Makoto Kamada, Prime numbers of the form 600...001.
MATHEMATICA
Select[Table[6*10^n+1, {n, 0, 70}], PrimeQ] (* Harvey P. Dale, Feb 22 2015 *)
PROG
(Magma) [a: n in [0..250]|IsPrime(a) where a is 6*10^n+1];
CROSSREFS
KEYWORD
nonn
AUTHOR
Vincenzo Librandi, Dec 10 2010
STATUS
approved