8^4-sqrt9*1=61
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a+(n-1)*4
49, 64, 81
1 x 2 sqrt(4) = 4
106------------------------------------------------------------------------------------------------From Rafaelrz.You can make, 4P3 = 4!/(4-3)! = 24, different 3 digit numbers using 1, 2, 3 and 4.
1124 1224 1244