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A062589
Numbers k such that 23^k - 22^k is prime, or a strong pseudoprime.
8
229, 241, 673, 5387, 47581
OFFSET
1,1
COMMENTS
Terms greater than 1000 often correspond to "unproven" strong pseudoprimes.
a(6) > 10^5. - Robert Price, Aug 22 2012
KEYWORD
nonn,hard
AUTHOR
Mike Oakes, May 18 2001, May 19 2001
EXTENSIONS
a(5) from Robert Price, Aug 22 2012
Edited by M. F. Hasler, Sep 21 2013
STATUS
approved