login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A059676 Numbers n such that n*5^n - 1 is prime. 13
8, 14, 42, 384, 564, 4256, 6368, 21132, 27180, 96584, 349656, 545082 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..12.

Steven Harvey, Generalized Woodall Search

MATHEMATICA

Do[ If[ PrimeQ[ n*5^n - 1 ], Print[ n ]], {n, 1, 4000} ]

PROG

(PARI) is(n)=ispseudoprime(n*5^n-1) \\ Charles R Greathouse IV, May 22 2017

CROSSREFS

Sequence in context: A121866 A301961 A250478 * A242198 A111050 A009453

Adjacent sequences:  A059673 A059674 A059675 * A059677 A059678 A059679

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Feb 05 2001

EXTENSIONS

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

a(11)-a(12) from Harvey link by Ray Chandler, Apr 10 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 1 15:05 EDT 2020. Contains 337443 sequences. (Running on oeis4.)