Question

What is this pattern 1,6,26,106,_,_,_ rule

Answer 1

http://www.wolframalpha.com/input/?i=1%2C6%2C26%2C106...

Answer 2

+5, +20, +80

See it?

Answer 3

5(2^(2n))???

Answer 4

\[a _{n+1}=a _{n}+5(2^{2n})?\]

Answer 5

the 1st 1 being 1? thats the only thing i could come up with

Answer 6

or 5(4^n)

Answer 7

It's the difference X 4 then add the last number. 1,6,26,106,426,1706
1-6=5x4=20+6=26 6-26=20x4=80+26=106 26-106=80x4=320+106=426
106-426=320x4=1280+426=1706