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A059675 Numbers n such that n*6^n - 1 is prime. 13
1, 2, 3, 19, 20, 24, 34, 77, 107, 114, 122, 165, 530, 1999, 4359, 11842, 12059, 13802, 22855, 41679, 58185, 145359, 249987 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..23.

Steven Harvey, Generalized Woodall Search

MATHEMATICA

Do[ If[ PrimeQ[ n*6^n - 1 ], Print[ n ] ], {n, 1, 3500} ]

PROG

(PARI) is(n)=ispseudoprime(n*6^n-1) \\ Charles R Greathouse IV, May 22 2017

CROSSREFS

Sequence in context: A269251 A092925 A082012 * A128353 A217691 A109418

Adjacent sequences:  A059672 A059673 A059674 * A059676 A059677 A059678

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Feb 05 2001

EXTENSIONS

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008

a(22)-a(23) from Harvey link by Ray Chandler, Apr 10 2016

STATUS

approved

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Last modified February 19 19:21 EST 2020. Contains 332047 sequences. (Running on oeis4.)