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.

A123677 Primes p such that Lucas(prime(p)) is prime, where Lucas = A000032.

Original entry on oeis.org

3, 5, 7, 11, 13, 71, 113, 643, 769, 13681, 51929
Offset: 1

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Author

Alexander Adamchuk, Oct 05 2006

Keywords

Comments

These are the primes in A120561.
Numbers n such that Lucas(prime(n)) is prime are listed in A120561; indices of prime Lucas numbers are listed in A001606.

Crossrefs

Cf. A000032, A123678, A120561, A001606, A119984, A122534, A277290.

Formula

a(n) = prime(A123678(n)).
a(n) = pi(A277290(n)). - Bobby Jacobs, Oct 30 2016

Extensions

51929 found by Henri Lifchitz, from Jens Kruse Andersen, Jul 24 2014

A123678 Numbers n such that Lucas(prime(prime(n))) is prime, where Lucas(k) = A000032(k).

Original entry on oeis.org

2, 3, 4, 5, 6, 20, 30, 117, 136, 1616, 5313
Offset: 1

Views

Author

Alexander Adamchuk, Oct 05 2006

Keywords

Comments

Indices of prime Lucas numbers are listed in A001606.
Numbers n such that Lucas(prime(n)) is prime are listed in A120561.
Primes in A120561 are listed in A123677(n) = prime(a(n)).

Crossrefs

Cf. A000032, A123677, A120561, A001606, A277290.
Cf. A119984, A122534 (Numbers n such that Fibonacci(prime(prime(n))) is prime).

Formula

a(n) = pi(A123677(n)).
a(n) = pi(pi(A277290(n))). - Bobby Jacobs, Oct 30 2016

Extensions

5313 found by Henri Lifchitz, from Jens Kruse Andersen, Jul 24 2014
Showing 1-2 of 2 results.

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