A152177 Smallest prime factor of G+n, where G is any sufficiently large power tower of 3, e.g., Graham's number.

3, 2, 11, 2, 61094071, 2, 3, 2, 5, 2, 17, 2, 3, 2, 41, 2, 147331, 2, 3, 2, 19, 2, 7, 2, 3, 2, 101117, 2, 5, 2, 3, 2, 293, 2

Offset

0,1

Links

Table of n, a(n) for n=0..33.

Wikipedia, Graham's number

Example

a(2) = 11 because 3^3^3^... + 2 = 0 (mod 11).

Crossrefs

Cf. A152178.

Sequence in context: A248242 A215598 A322603 * A110326 A112061 A238398

Adjacent sequences: A152174 A152175 A152176 * A152178 A152179 A152180

Keyword

nonn,more

Author

Karl W. Heuer, Nov 28 2008

Status

approved