A321792 Lesser of twin primes of the form 6*Fibonacci(k)-1.

5, 11, 17, 29, 278207, 63661259146337

Offset

1,1

Comments

Corresponding values for k are 1 or 2, 3, 4, 5, 24, 64, ... Also a(7), if it exists, exceeds 6*Fibonacci(150000).

Links

Table of n, a(n) for n=1..6.

Example

17 = 6*Fibonacci(4) - 1 = 6*3 - 1.

Prog

(PARI)
for (n=2, 1000, if (ispseudoprime (p=6*fibonacci(n)-1) && ispseudoprime (p+2), print1(p", ")))

Crossrefs

Cf. A001359 (lesser of twin primes).

Sequence in context: A268521 A230138 A231652 * A068072 A136292 A088046

Adjacent sequences: A321789 A321790 A321791 * A321793 A321794 A321795

Keyword

nonn,more

Author

Gilbert Mozzo, Jan 12 2019

Status

approved