Question

what is the rule pattern for 9,11,15,23,39,7? i got 9+2=11+4=15+8=23+16=39-32=7 Is it +2 x2?

Answer 1

Is that 7 on the end really part of the series?

Answer 2

yes

Answer 3

well, for the first five the series is An = 2^n + 7
but with that 7 on the end, I don't think there is one
but I have been wrong once before, so....

Answer 4

I think that this: what is the rule pattern for 9,11,15,23,39,7 ?

is supposed to say: what is the rule pattern for 9,11,15,23,39,71 ?

9, 11, 15, 23 ,39, 71, ...

2^n + 7 --> rule pattern where n = a posititve integer.