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Problem
Problem
Total number of divisors of
N
=
3
5
⋅
5
7
⋅
7
9
N = 3^5 \cdot 5^7 \cdot 7^9
N
=
3
5
⋅
5
7
⋅
7
9
that are of the form
4
n
+
1
4n+1
4
n
+
1
,
n
≥
0
n \ge 0
n
≥
0
is equal to a. 15 b. 30 c. 120 d. 240
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