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A152178
Smallest prime factor of G-n, where G is any sufficiently large power tower of 3, e.g., Graham's number.
2
3, 2, 5, 2, 107, 2, 3, 2, 101, 2, 29, 2, 3, 2, 13, 2, 3626257, 2, 3, 2, 7, 2, 5, 2, 3, 2, 1511, 2, 173, 2, 3, 2, 5, 2, 7, 2, 3, 2, 197, 2, 13, 2, 3, 2, 17491, 2, 18540593, 2, 3, 2, 53, 2, 5, 2, 3, 2, 19, 2, 17, 2, 3, 2, 5, 2, 11, 2, 3, 2, 29, 2, 97, 2, 3, 2, 251
OFFSET
0,1
COMMENTS
Least prime p such that A240162(p) == n (mod p). - Jinyuan Wang, Aug 30 2020
LINKS
EXAMPLE
a(2) = 5 because 3^3^3^... - 2 = 0 (mod 5).
CROSSREFS
Sequence in context: A319044 A230820 A324549 * A274164 A103340 A106615
KEYWORD
nonn
AUTHOR
Karl W. Heuer, Nov 28 2008
STATUS
approved