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A083724 Numbers k such that 11*7^k + 2 is prime. 0
0, 1, 2, 5, 8, 9, 42, 44, 46, 66, 69, 73, 88, 234, 257, 344, 1280, 1930, 2601, 2826, 3506, 6313, 22858, 25478, 32586, 61701, 65406 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Some of the larger entries may only correspond to probable primes.

No more terms <= 10^5. - Tyler NeSmith

LINKS

Table of n, a(n) for n=1..27.

EXAMPLE

Primes 13, 79, 541, 184879 are 11*7^0+2, 11*7^1+2, 11*7^2+2, 11*7^5+2.

PROG

(PARI) for(n=0, 6000, if(isprime(11*7^n+2), print1(n, ", ")))

CROSSREFS

Sequence in context: A243182 A088620 A068702 * A072476 A167541 A078345

Adjacent sequences: A083721 A083722 A083723 * A083725 A083726 A083727

KEYWORD

nonn

AUTHOR

Rick L. Shepherd, May 08 2003

EXTENSIONS

a(22)-a(27) from Tyler NeSmith, Jan 19 2021

STATUS

approved

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Last modified December 3 05:56 EST 2022. Contains 358512 sequences. (Running on oeis4.)