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A059676 Numbers n such that n*5^n - 1 is prime. 13

%I

%S 8,14,42,384,564,4256,6368,21132,27180,96584,349656,545082

%N Numbers n such that n*5^n - 1 is prime.

%H Steven Harvey, <a href="http://harvey563.tripod.com/GeneralizedWoodallPrimes.txt">Generalized Woodall Search</a>

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

%o (PARI) is(n)=ispseudoprime(n*5^n-1) \\ _Charles R Greathouse IV_, May 22 2017

%K nonn

%O 1,1

%A _Robert G. Wilson v_, Feb 05 2001

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

%E a(11)-a(12) from Harvey link by _Ray Chandler_, Apr 10 2016

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Last modified April 22 07:26 EDT 2021. Contains 343163 sequences. (Running on oeis4.)