A102170 Primes of the form (7^k-1)/6.

2801, 16148168401, 85053461164796801949539541639542805770666392330682673302530819774105141531698707146930307290253537320447270457

Offset

1,1

Comments

The next term, for k=149, has 126 digits.

Links

Table of n, a(n) for n=1..3.

Mathematica

Select[(7^Range[200]-1)/6, PrimeQ]

Crossrefs

Cf. A023000 ((7^n-1)/6), A004063 (n such that (7^n-1)/6 is prime).

Sequence in context: A292011 A306849 A022233 * A031551 A031731 A252048

Adjacent sequences: A102167 A102168 A102169 * A102171 A102172 A102173

Keyword

nonn,bref

Author

Roger L. Bagula, Mar 15 2005

Status

approved