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

49, 90, 206, 314, 375, 578, 949, 2883, 2959, 3133, 3409, 6174, 6185, 16461, 22313, 24462, 30249, 45317, 58169, 60309, 79202

Offset

1,1

Comments

a(22) > 10^5. - Robert Price, May 04 2016

Links

Table of n, a(n) for n=1..21.

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

Adjacent sequences: A273934 A273935 A273936 * A273938 A273939 A273940

Keyword

nonn,more

Author

Robert Price, Jun 04 2016

Status

approved