A059746 Numbers k such that 3*2^k + 7 is prime.

1, 2, 3, 5, 6, 9, 10, 11, 19, 22, 30, 35, 41, 91, 101, 125, 261, 706, 750, 1315, 1629, 2082, 2979, 3029, 3077, 3950, 4097, 5491, 5746, 10761, 12946, 14770, 15642, 30006, 34157, 34722, 48499, 62862

Offset

1,2

Comments

According to PRP Records, this sequence contains 131867, 164205, 185429, 232750, 256149, 295139, 315067, 368489. - Jason Yuen, Sep 02 2024

Links

Table of n, a(n) for n=1..38.

Henri Lifchitz and Renaud Lifchitz, PRP Records.

Mathematica

Do[ If[ PrimeQ[ 3*2^n + 7 ], Print[n] ], {n, 1, 3000} ]

Prog

(PARI) is(n)=ispseudoprime(3*2^n+7) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Cf. A059747.

Sequence in context: A166687 A189224 A018762 * A362030 A024620 A232527

Adjacent sequences: A059743 A059744 A059745 * A059747 A059748 A059749

Keyword

nonn,more

Author

Robert G. Wilson v, Feb 10 2001

Extensions

More terms from Robert G. Wilson v, Jan 28 2003

a(33) from Michael S. Branicky, Jan 09 2023

a(34) from Michael S. Branicky, Jan 12 2023

a(35)-a(37) from Michael S. Branicky, Apr 06 2023

a(38) from Michael S. Branicky, Jul 31 2024

Status

approved