A062622 Numbers k such that 56^k - 55^k is a prime.

3, 17, 293, 1303, 3331, 4639, 7043, 35201, 46441

Offset

1,1

Comments

Terms greater than 1000 often correspond only to strong pseudoprimes. [Clarified by M. F. Hasler, Sep 15 2013]

a(10) > 10^5. - Robert Price, Oct 26 2013

Links

Table of n, a(n) for n=1..9.

Crossrefs

Cf. A000043, A057468, A059801, A059802, A062572-A062666.

Sequence in context: A365364 A374315 A155201 * A271609 A290806 A009592

Adjacent sequences: A062619 A062620 A062621 * A062623 A062624 A062625

Keyword

nonn,hard

Author

Mike Oakes, May 18 2001, May 19 2001

Extensions

a(8)-a(9) from Robert Price, Oct 26 2013

Status

approved