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A273937 Numbers n such that 7^n - 6^(n+1) is prime. 0

%I #7 Jun 08 2016 01:51:11

%S 49,90,206,314,375,578,949,2883,2959,3133,3409,6174,6185,16461,22313,

%T 24462,30249,45317,58169,60309,79202

%N Numbers n such that 7^n - 6^(n+1) is prime.

%C a(22) > 10^5. - _Robert Price_, May 04 2016

%t Select[Range[12, 100000], PrimeQ[7^# - 6^(# + 1)] &]

%o (PARI) is(n)=ispseudoprime(7^n-6^(n+1)) \\ _Charles R Greathouse IV_, Jun 08 2016

%Y Cf. A093765.

%K nonn,more

%O 1,1

%A _Robert Price_, Jun 04 2016

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Last modified July 21 13:28 EDT 2024. Contains 374474 sequences. (Running on oeis4.)