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9, 81, 6561, 43046721, ...

This would be the sequence 9^(2^(n-1))

Q: What is the missing number in the sequence 9 6561 43046721?

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square of 6561 is 43046721 square root is 81

There should only be four numbers in the question: 3, 9, 81 and 6561. Then the fifth is 43046721.

812= 6561812= 6561812= 6561812= 6561

65613 = 6561 x 6561 x 6561 = 282429536481

The square root of 6561 is 81

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square of 6561 is 43046721 square root is 81

The numbers are being squared: 32 = 9 92 = 81 812 = 6561 65612 = 43046721

There should only be four numbers in the question: 3, 9, 81 and 6561. Then the fifth is 43046721.

Any multiple of that number: 6561 x 0 6561 x 1 6561 x 2 etc.

The factors of 387420489 are 1, 3, 9, 27, 81, 243, 729, 2187, 6561, 19683, 59049, 177147, 531441, 1594323, 4782969, 14348907, 43046721, 129140163, 387420489

812= 6561812= 6561812= 6561812= 6561

6561 = 6561.0 or 6561 = 6561/1

65613 = 6561 x 6561 x 6561 = 282429536481

12

The square root of 6561 is 81

6561^3 = 282,429,536,481.

9^(4) = 9 x 9 x 9 x 9 = 81 x 81 = 6561