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1 solution
1st term (2-1)²=1
2nd term (3-1)²=4
3rd term (5-1)²=16
4th term (7-1)²=36
5th term (11-1)²=100
6th term (13-1)²=144
7th term (17-1)²=256
So our answer will be ( 1 9 − 1 ) ² = 3 2 4
Actually they are in (p-1)² form , where the values of p are primes in serial.