A272776 Numbers n such that phi(Fibonacci(n)) is a square.

1, 2, 3, 5, 6, 9, 22, 33

Offset

1,2

Comments

Corresponding distinct Fibonacci numbers for listed terms are 1, 2, 5, 8, 34, 17711, 3524578.

a(9) > 1000 (range of the b-file in A065449), if it exists. - R. J. Mathar, May 08 2016

Links

Table of n, a(n) for n=1..8.

Prog

(PARI) lista(nn) = for(n=1, nn, if(issquare(eulerphi(fibonacci(n))), print1(n, ", ")));

Crossrefs

Cf. A000010, A000045, A000290, A065449.

Sequence in context: A256230 A079371 A131761 * A055690 A108861 A294634

Adjacent sequences: A272773 A272774 A272775 * A272777 A272778 A272779

Keyword

nonn,more

Author

Altug Alkan, May 06 2016

Status

approved