Question

what should come next in the series 3 11 31 57 91 133

Answer 1

There is little mistake in question, it is 13 not 11
now,
(1)² + 2= 3
(3)² +4 = 13
(5)² +6 = 31
(7)² +8 =57
(9)² +10 =91
(11)² +12 = 133
so, (13)² + 14 =183

hope you understand the sequence :)

Answer 2

dat shud b 13 not 11
so,
(1)² + 2= 3
(3)² +4 = 13
(5)² +6 = 31
(7)² +8 =57
(9)² +10 =91
(11)² +12 = 133
so, (13)² + 14 =183