Its all about the number 2!

How many increasing 3 3 -term geometric progressions can be obtained from the sequence 1 , 2 , 2 2 , 2 3 , . . . , 2 2017 ? 1,2,2^2,2^3,...,2^{2017}?

Example: ( 2 3 , 2 6 , 2 9 ) (2^3, 2^6, 2^9) is a 3 3 -term geometric progression.


The answer is 1017072.

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