OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..494
EXAMPLE
8 is member because the number of proper divisors of 8 is 3, a prime number.
MATHEMATICA
Fibonacci[Select[Range[60], PrimeQ[DivisorSigma[0, Fibonacci[ # ]] - 1] &]] (* Stefan Steinerberger, Jan 31 2009 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Jan 25 2009
EXTENSIONS
More terms from Stefan Steinerberger, Jan 31 2009
STATUS
approved