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A062588
Numbers k such that 22^k - 21^k is prime.
1
OFFSET
1,1
COMMENTS
All terms are prime.
No other terms less than 10^5. - Robert Price, May 28 2012
PROG
(PARI) is(n)=ispseudoprime(22^n-21^n) \\ Charles R Greathouse IV, Jun 12 2017
KEYWORD
nonn,hard,bref,more
AUTHOR
Mike Oakes, May 18 2001, May 19 2001
STATUS
approved