cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

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

Original entry on oeis.org

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

Views

Author

Alexander Adamchuk, Sep 18 2006

Keywords

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.

Crossrefs

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

Formula

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

A277575 Primes p such that Fibonacci(prime(p)) is prime.

Original entry on oeis.org

2, 3, 5, 7, 23, 83, 97, 12161, 13681, 36467
Offset: 1

Views

Author

Bobby Jacobs, Oct 20 2016

Keywords

Comments

Suggested by Alexander Adamchuk in A122534.

Crossrefs

Primes in A119984.
Cf. A000040, A000045, A001605, A005478, A006450, A030426, A075737, A083668, A093308, A122534, A277284.

Programs

  • PARI
    isok(p) = isprime(p) && isprime(fibonacci(prime(p))); \\ Michel Marcus, Oct 22 2016

Formula

a(n) = prime(A122534(n)).
a(n) = PrimePi(A277284(n)).
Showing 1-2 of 2 results.

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