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A062617
Numbers k such that 51^k - 50^k is prime.
0
2, 7, 139, 383, 1187, 5857, 41281
OFFSET
1,1
COMMENTS
Terms greater than 1000 are often only strong pseudoprimes.
a(8) > 10^5. - Robert Price, Feb 28 2013
PROG
(PARI) is(n)=ispseudoprime(51^n-50^n) \\ Charles R Greathouse IV, Jun 13 2017
KEYWORD
nonn,hard
AUTHOR
Mike Oakes, May 18 2001, May 19 2001
EXTENSIONS
a(7) from Robert Price, Feb 28 2013
STATUS
approved