A134580 - OEIS

A134580

Numbers k such that k * Fibonacci(k) - 1 is prime.

3, 4, 6, 8, 16, 18, 24, 33, 36, 94, 348, 524, 644, 1218, 1458, 2064, 2960, 3591, 5744, 13056, 27438, 35193, 43554, 80960, 95596, 112611, 118104

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OFFSET

1,1

COMMENTS

Some of the larger entries may only correspond to probable primes.

LINKS

MATHEMATICA

Select[Range[1, 1000], PrimeQ[#*Fibonacci[#]-1]&] (* Julien Kluge, Sep 20 2016 *)

PROG

(PARI) isok(n) = isprime(n*fibonacci(n) - 1); \\ Michel Marcus, Sep 20 2016

CROSSREFS

KEYWORD

more,nonn

AUTHOR

Jason Earls, Jan 23 2008

EXTENSIONS

a(24)-a(27) from Michael S. Branicky, Dec 13 2024

STATUS

approved