A161675 Mersenne primes written in base 8.

3, 7, 37, 177, 17777, 377777, 1777777, 17777777777, 177777777777777777777, 377777777777777777777777777777, 377777777777777777777777777777777777, 1777777777777777777777777777777777777777777

Offset: 1

Author

Vladislav-Stepan Malakhovsky & Juri-Stepan Gerasimov, Jun 16 2009

Keywords

• nonn
• base

Links

• Amiram Eldar, Table of n, a(n) for n = 1..17

Crossrefs

Cf. A000668, A007094, A117293.

Programs

Mathematica

Map[FromDigits[IntegerDigits[2^# - 1, 8]] &, MersennePrimeExponent[Range[12]]] (* Amiram Eldar, Oct 22 2024 *)

Formula

a(n) = A007094(A000668(n)).

Extensions

a(6) and a(10) corrected by R. J. Mathar, Aug 03 2009