A059614 Numbers k such that 6^k - 5 is prime.

2, 3, 4, 29, 31, 34, 53, 65, 94, 202, 288, 415, 457, 483, 703, 762, 1285, 1464, 2094, 3384, 9335, 15955, 18910, 73119, 125418, 143273, 584279

Offset

1,1

Comments

The next term in the sequence is greater than 12400. - Dmitry Kamenetsky, Oct 02 2008

Links

Table of n, a(n) for n=1..27.

Henri Lifchitz and Renaud Lifchitz, PRP Records.

Example

65 is present because 6^65 - 5 is prime.

Prog

(PARI) is(n)=ispseudoprime(6^n-5) \\ Charles R Greathouse IV, Feb 20 2017

Crossrefs

Sequence in context: A274677 A062931 A100604 * A333074 A241974 A226055

Adjacent sequences: A059611 A059612 A059613 * A059615 A059616 A059617

Keyword

nonn

Author

Andrey V. Kulsha, Feb 09 2001

Extensions

a(21), corresponding to a probable prime, from Dmitry Kamenetsky, Oct 02 2008

a(22)-a(23) from Henri Lifchitz

a(24)-a(25) from Lelio R. Paula

a(26) from Paul Bourdelais, Jan 28 2021

a(27) from Paul Bourdelais, Feb 26 2021

Status

approved