Directions: In the following number series, one number is wrong. Find out the wrong number. -400, -402, -405, -420, -440, -470

The series follows a pattern based on prime numbers, where each subsequent term is obtained by subtracting consecutive prime numbers. The differences between the terms are -2, -3, -5, -7 and -11, which are consecutive primes. To maintain this pattern, the third term should be -402 minus 5, which equals -407 instead of -405. Therefore, the wrong number is -405.

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