What is the least common multiple of 15.25.35? How to solve this problem?

It's not easy to find three at the same time divided by 5 to get 3.5.7, then 3x5x7 = 105

Find the rules: 1 and 1 / 2, 3 and 3 / 5, 5 and 8 / 15, 7 and 21 / 34
Looking for the law, 1 and 2 of 1, 3 and 5 and 15 of 8, 7 and 34 of 21, above the wrong number

The next one is: 31 out of 9 and 64
It is divided into three parts: the integer part is odd law 1,3,5,7,9;
The denominator part is the law of difference and then difference;
The molecular part is the law of double plus odd

1, 3, 7, 31, 63127, the number of vacancies should be

1=2^1-1
3=2^2-1
7=2^3-1
?=2^4-1
31=2^5-1
63=2^6-1
127=2^7-1
So it should be 15

What number should be filled in 2,3,7,15,31,63127, (), 511()

2,3,7,15,31,63,127,(255 ),511 ( 1032)
law:
The difference between two adjacent numbers: 1, 4, 8, 16, 32, 64, 128, 256, 512

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What is the least common multiple of 15.25.35? How to solve this problem?