OFFSET
0,2
EXAMPLE
a(4)=64 since 3^4=81 and 64 <= 81 < 128.
MAPLE
PROG
(PARI) a(n) = 2^logint(3^n, 2); \\ Michel Marcus, Sep 06 2022
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Henry Bottomley, Oct 25 2004
STATUS
approved