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A059075 Numbers k such that 2*7^k + 3 is prime. 0
0, 1, 2, 5, 11, 30, 57, 78, 91, 390, 462, 667, 1214, 1811, 2054, 2937, 3055, 8518, 10665 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
a(20) > 21059. - Jinyuan Wang, Dec 08 2019
LINKS
MATHEMATICA
Do[ If[ PrimeQ[ 2*7^n + 3 ], Print[n] ], {n, 1, 6000} ]
PROG
(PARI) is(n)=ispseudoprime(2*7^n+3) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
Sequence in context: A264771 A176637 A272675 * A345882 A121134 A144959
KEYWORD
nonn,more
AUTHOR
Robert G. Wilson v, Feb 12 2001
EXTENSIONS
a(18)-a(19) from Jinyuan Wang, Dec 08 2019
STATUS
approved

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Last modified June 19 18:58 EDT 2024. Contains 373507 sequences. (Running on oeis4.)