OFFSET
1,1
LINKS
Robert Munafo, 2^^N == 2^(2^N) mod N
EXAMPLE
7 is in the sequence because 2^2^7 = 2^128 == 4 mod 7, but 2^^7 = 2^2^2^2^2^2^2 == 2 mod 7.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Robert Munafo, Jun 24 2009
STATUS
approved