Question

What is the Pattern 4,25,130,655

Answer 1

Somewhere a round six

i think 6.25

Answer 2

This pattern looks complicated so it could be anything. One possible pattern is

 a(n) = ( 21·5ⁿ - 25 ) / 20

So pattern starts at n=1 and sequence would be 4, 25, 130, 655, 3280, ...