0,6

H. J. Smith, XICalc - Extra Precision Integer Calculator.

a(n) = PiPrime(Fibonacci(Fibonacci(n))

a(7) = 51 because Fib(7) = 13, Fib(13) = 233 and there are 51 primes <= 233.

PrimePi@# & /@ (Fibonacci@Fibonacci@# & /@ Range@10) [From Robert G. Wilson, v (rgwv(AT)rgwv.com), Feb 17 2009]

(Other) (XICalc) Pi(Fib(Fib(n)));

A007570

Sequence in context: A005444 A019044 A019035 this_sequence A026088 A121567 A101361

Adjacent sequences: A153382 A153383 A153384 this_sequence A153386 A153387 A153388

nonn

Harry J. Smith (hjsmithh(AT)sbcglobal.net), Dec 25 2008