‌‌‌7,  ‌‌26, ‌‌‌124, ‌‌342,  ?  ↓  ‌‌‌‌↓   ↓  ‌‌‌↓  ‌‌‌↓ 23−1‌‌‌33−1‌‌‌53−1‌‌‌73−1‌‌‌113−1 The series is formed by subtracting 1 from cubes of consecutive prime numbers. ∴?=113–1=1330