Question

What comes next...
7 23 71 215 _____

Answer 1

The next number is 647.

This is the sequence:

7 + 16 = 23

(16x3=48)

23+48=71

(48x3=144)

71+144=215

(144x3=432)

215+432=647

And so forth. Hope this helps.

Answer 2

Explanation:

Multiply by 3 and add up by 2 215.3+2 =347 olur kolay gelsin