A122534 Numbers k such that Fibonacci(prime(prime(k))) is prime.

1, 2, 3, 4, 9, 23, 25, 1456, 1616, 3865

Offset

1,2

Comments

The corresponding primes are {2,5,89,1597,99194853094755497,...}.

Numbers k such that A093308(k) is prime.

A277575(n) = prime(a(n)) is a prime in A119984.

Links

Table of n, a(n) for n=1..10.

Formula

a(n) = PrimePi(A277575(n)) = PrimePi(PrimePi(A277284(n))). - Bobby Jacobs, Oct 26 2016

Crossrefs

Cf. A000040, A000045, A119984, A083668, A093308, A075737, A001605, A006450, A005478, A030426, A277284, A277575.

Sequence in context: A361326 A280016 A089243 * A101135 A280054 A088220

Adjacent sequences: A122531 A122532 A122533 * A122535 A122536 A122537

Keyword

hard,more,nonn

Author

Alexander Adamchuk, Sep 18 2006

Status

approved