Representing a big number

How many ordered triples of positive integers ( a , b , c ) (a,b,c) are there such that their product is 1 0 6 ? 10^6?


The answer is 784.

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2 solutions

Bogdan Simeonov
Jan 4, 2014

The ways to represent n = p 1 k 1 . . . p r k r n=p_1^{k_1}...p_r^{k_r} as a product of δ \delta factors is

ρ δ ( n ) = k i = υ p ( n ) ( k i + δ 1 k i ) \rho_\delta (n)=\displaystyle\prod_{k_i=\upsilon_p(n)}\binom{k_i+\delta-1}{k_i}

So when δ = 3 \delta=3 our answer is 28.28= 784 \boxed{784} .

Note :If someone could tell me if there actually is such a function ρ δ ( n ) \rho_\delta(n) , please tell me, because I have found it by myself while solving problems such as this one.

Incredible Mind
Jun 19, 2015

although i got it right the below mentiond way...i found a problem that is

4 4 k and 4 4 k will be added in the combinations..where k is sutable number

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