You simply add three consecutive integers (for instance 1,2,3 or 25,26,27) and take the square.
Example: (12+13+14)2 = 392 = 1521.
Or generally: (n + (n+1) + (n+2))2, where n is the first integer.
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9 and 10
Yes but the on prime numbers are 2,3
The numbers are 30, 31 and 32.
2 and 3
The numbers are 9, 11 and 13.