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A123677 Primes p such that Lucas(prime(p)) is prime, where Lucas = A000032. 3
3, 5, 7, 11, 13, 71, 113, 643, 769, 13681, 51929 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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.

LINKS

Table of n, a(n) for n=1..11.

FORMULA

a(n) = prime(A123678(n)).

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

CROSSREFS

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

Sequence in context: A288370 A108817 A288892 * A133954 A087325 A072151

Adjacent sequences:  A123674 A123675 A123676 * A123678 A123679 A123680

KEYWORD

hard,more,nonn

AUTHOR

Alexander Adamchuk, Oct 05 2006

EXTENSIONS

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

STATUS

approved

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Last modified August 13 02:52 EDT 2020. Contains 336441 sequences. (Running on oeis4.)