cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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

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%I A118842 #25 Feb 16 2025 08:33:01
%S A118842 2,3,5,7,47,2207
%N A118842 Primes of the form ceiling(phi^k).
%H A118842 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Phi-Prime.html">Phi-Prime</a>.
%F A118842 a(n) = A062724(A118841(n)). - _R. J. Mathar_, Sep 07 2007
%t A118842 Select[Table[Ceiling[GoldenRatio^n],{n,20}],PrimeQ] (* _James C. McMahon_, Sep 15 2024 *)
%o A118842 (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 A118842 Cf. A118841.
%K A118842 nonn,hard
%O A118842 1,1
%A A118842 _Eric W. Weisstein_, May 01 2006