A118842 Primes of the form ceiling(phi^k).

2, 3, 5, 7, 47, 2207

Offset: 1

Author

Eric W. Weisstein, May 01 2006

Keywords

• nonn
• hard

Links

• Eric Weisstein's World of Mathematics, Phi-Prime.

Crossrefs

Cf. A118841.

Programs

Mathematica

Select[Table[Ceiling[GoldenRatio^n],{n,20}],PrimeQ] (* James C. McMahon, Sep 15 2024 *)

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

Formula

a(n) = A062724(A118841(n)). - R. J. Mathar, Sep 07 2007