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Mathematics
Mathematics
Problem
Let
f
(
1
)
=
3
f(1) = 3
f
(
1
)
=
3
and
f
(
n
+
1
)
=
3
f
(
n
)
f(n+1) = 3^{f(n)}
f
(
n
+
1
)
=
3
f
(
n
)
for
n
>
0
n > 0
n
>
0
. Find the last two digits of
f
(
20
)
f(20)
f
(
20
)
.
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