Direction : Given below are two number series. Series I is a missing series…

Direction : Given below are two number series. Series I is a missing series while series II is a wrong number series which follows pattern of series I only.
1. 11, P, 181, 350, 639, 1000
2. 242, 251, 255, 280, 329, 450, 619

If ‘y’ is the wrong number of the series II, then find the value of ‘2y+1’.