‌‌‌6,  ‌‌11,  ‌27,  51,  ?  ↓  ‌‌‌‌↓   ↓  ‌‌‌↓  ‌‌↓ 22+2‌‌‌32+2‌‌‌52+2‌‌‌72+2‌‌‌112+2 The series is formed by adding 2 to squares of consecutive prime numbers.∴?=112+2=123