1,2

Table of n, a(n) for n=1..68.

a(n) seems to be asymptotic to c*n with c=1.7...

Select[Range[120], CoprimeQ[2^#-1, Fibonacci[#]]&] (* Harvey P. Dale, Nov 27 2015 *)

Sequence in context: A050747 A261514 A215798 * A292938 A056900 A226808

Adjacent sequences: A074777 A074778 A074779 * A074781 A074782 A074783

nonn

Benoit Cloitre, Sep 07 2002

approved