

A272776


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


0




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 bfile 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



