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A272776 Numbers n such that phi(Fibonacci(n)) is a square. 0
1, 2, 3, 5, 6, 9, 22, 33 (list; graph; refs; listen; history; text; internal format)
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

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Last modified June 20 08:01 EDT 2021. Contains 345162 sequences. (Running on oeis4.)