A084713 Smallest prime of the form (2n-1)^k + 2, or 0 if no such number exists.

3, 5, 7, 0, 11, 13, 0, 17, 19, 0, 23, 952809757913929, 0, 29, 31, 0, 1091, 37, 0, 41, 43, 0, 47

Offset

1,1

Comments

a(3n+1) = 0, a(24) = 47^113 - 2 is a 189-digit number.

Links

Sean A. Irvine, Table of n, a(n) for n = 1..83

Example

a(12) = 952809757913927 = 23^11 + 2.

Crossrefs

Cf. A084714.

Sequence in context: A223174 A225401 A085090 * A162538 A324990 A084712

Adjacent sequences: A084710 A084711 A084712 * A084714 A084715 A084716

Keyword

nonn

Author

Amarnath Murthy, Jun 10 2003

Extensions

Edited by Robert G. Wilson v, Jun 11 2003

Status

approved