A335976 Numbers k such that Fibonacci(6*k) is not a totient.

0, 11, 13, 17, 29, 31, 41, 43, 47, 53, 61, 71, 73, 79, 81, 83, 89, 97, 101, 103

Offset

1,2

Comments

Conjecture: Sequence contains infinitely many primes.

Links

Table of n, a(n) for n=1..20.

Example

11 is a term since Fibonacci(66) = 27777890035288 is not a totient number.

Prog

(PARI) isok(n) = !istotient(fibonacci(6*n))

Crossrefs

Cf. A000010, A007617, A134492, A280592, A280681.

Sequence in context: A289701 A250402 A356383 * A052031 A166009 A240107

Adjacent sequences: A335973 A335974 A335975 * A335977 A335978 A335979

Keyword

nonn,more

Author

Altug Alkan, Jul 03 2020

Extensions

a(12)-a(20) from Max Alekseyev, Aug 02 2020

Status

approved