A062589 Numbers k such that 23^k - 22^k is prime, or a strong pseudoprime.

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

Links

Table of n, a(n) for n=1..5.

Crossrefs

Cf. A000043, A057468, A059801, A059802, A062572-A062588, A214658, A214655, A062592-A062666.

Sequence in context: A061783 A140017 A119711 * A342368 A250235 A250236

Adjacent sequences: A062586 A062587 A062588 * A062590 A062591 A062592

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