Question

What the next term in the following series?
3,9, 15, 65, 35, 217, (?)​

Answer 1

Answer:

square-1 and q+1 example= 2square 4-1=3,and 2q=8+1=9,, 4sqr=16-1=15,and 4q=64+1=65,,and 6sqr=36-1=35,,6q=216+1=217,,and last stage its jump 2step explain 2then 4 then6.. (?)=it's become 8sqr=64-1=63,and 8q=512+1=513.