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A118842 Primes of the form ceiling(phi^n). 1

%I #12 Aug 15 2015 14:55:14

%S 2,3,5,7,47,2207

%N Primes of the form ceiling(phi^n).

%C a(7) = ceiling(phi^51169) has 10,694 decimal digits.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/Phi-Prime.html">Phi-Prime</a>

%F a(n)=A062724(A118841(n)). - _R. J. Mathar_, Sep 07 2007

%o (PARI) phi=(1+sqrt(5))/2;for(n=1,1e4,if(ispseudoprime(t=ceil(phi^n)),print1(t", "))) \\ _Charles R Greathouse IV_, Jul 29 2011

%Y Cf. A118841.

%K nonn,hard

%O 1,1

%A _Eric W. Weisstein_, May 01 2006

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Last modified April 16 12:36 EDT 2024. Contains 371711 sequences. (Running on oeis4.)