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A273937 Numbers n such that 7^n - 6^(n+1) is prime. 0
49, 90, 206, 314, 375, 578, 949, 2883, 2959, 3133, 3409, 6174, 6185, 16461, 22313, 24462, 30249, 45317, 58169, 60309, 79202 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
a(22) > 10^5. - Robert Price, May 04 2016
LINKS
MATHEMATICA
Select[Range[12, 100000], PrimeQ[7^# - 6^(# + 1)] &]
PROG
(PARI) is(n)=ispseudoprime(7^n-6^(n+1)) \\ Charles R Greathouse IV, Jun 08 2016
CROSSREFS
Cf. A093765.
Sequence in context: A247678 A093894 A259766 * A326257 A231275 A158725
KEYWORD
nonn,more
AUTHOR
Robert Price, Jun 04 2016
STATUS
approved

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Last modified June 19 11:49 EDT 2024. Contains 373503 sequences. (Running on oeis4.)