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A062645
Numbers k such that 79^k - 78^k is prime.
0
2, 5, 7, 41, 79, 2957, 9949
OFFSET
1,1
COMMENTS
Terms > 1000 are often only strong pseudoprimes.
a(8) > 10^5. - Robert Price, Nov 10 2014
PROG
(PARI) is(n)=ispseudoprime(79^n-78^n) \\ Charles R Greathouse IV, Jun 13 2017
KEYWORD
nonn,hard
AUTHOR
Mike Oakes, May 18 2001, May 19 2001
STATUS
approved