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The units place can be filled ini 4 ways ( 2, 3 ,5,7)
The tenth and the hundreds place can each be filled in 10 ways ( 0,1,2 ... 9)
The thousands place can be filled ini 4 ways ( 2, 3 ,5,7)

Hence the number of required numbers are 4 * 10 * 10 * 4 = 1600