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A272776
Numbers n such that phi(Fibonacci(n)) is a square.
0
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
PROG
(PARI) lista(nn) = for(n=1, nn, if(issquare(eulerphi(fibonacci(n))), print1(n, ", ")));
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Altug Alkan, May 06 2016
STATUS
approved