A259866 Primes of the form 3*10^k + 1.

31, 3001, 30000001, 30000000001, 30000000000000000000000000001, 3000000000000000000000000000000000001, 30000000000000000000000000000000000000000000000000000000000000000001

Offset: 1

Author

N. J. A. Sloane, Jul 08 2015

Keywords

• nonn

Links

• S. W. Golomb, Properties of the sequence 3.2^n+1, Math. Comp., 30 (1976), 657-663.
• S. W. Golomb, Properties of the sequence 3.2^n+1, Math. Comp., 30 (1976), 657-663. [Annotated scanned copy]

Crossrefs

Cf. A199683, A056807, A062339.

Programs

Mathematica

Select[3*10^Range[70]+1,PrimeQ] (* Harvey P. Dale, Jul 05 2020 *)

Formula

a(n) = 3*10^A056807(n)+1. - R. J. Mathar, Jul 15 2015