A177132 Primes of the form 6*10^n+1.

7, 61, 601, 600000001, 6000000001, 6000000000000001, 600000000000000000001, 600000000000000000000000001, 600000000000000000000000000000000000001, 6000000000000000000000000000000000000000000001, 600000000000000000000000000000000000000000000000000000000000000001

Offset

1,1

Links

Table of n, a(n) for n=1..11.

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

Cf. A056805.

Sequence in context: A269731 A199686 A113718 * A364430 A077642 A071172

Adjacent sequences: A177129 A177130 A177131 * A177133 A177134 A177135

Keyword

nonn

Author

Vincenzo Librandi, Dec 10 2010

Status

approved