common.or
auth.dont_have_account auth.register
৫, ১৩, ২১, ২৯, ৩৭, ...
(13-5)=8
(21-13)=8
So,(37+8)=45, (45+8)=53, (53+8)=61, (61+8)=69
Ans. 5,13,21,29,37,45,53,61,69.