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A062577
Numbers k such that 11^k - 10^k is prime.
6
3, 5, 19, 311, 317, 1129, 4253, 7699, 18199, 35153, 206081
OFFSET
1,1
COMMENTS
Terms greater than 1000 may correspond to unproven strong pseudoprimes.
PROG
(PARI) is(n)=ispseudoprime(11^n-10^n) \\ Charles R Greathouse IV, Feb 17 2017
KEYWORD
nonn,hard
AUTHOR
Mike Oakes, May 18 2001, May 19 2001
EXTENSIONS
Two more terms 18199 and 35153 from Jean-Louis Charton, Sep 02 2009
New term 206081 found by Jean-Louis Charton in October 2011
Edited by M. F. Hasler, Sep 16 2013
STATUS
approved