21*53 or 2*53 since the power 1 is rarely expressed.
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250 = 2x5x5x5
5,200 in standard index form = 5.2 × 103
2.9 million in standard index form = 2.9 × 106
1250 in standard index form = 1.25 × 103
7 x 7 x 7 is the expanded form of 343. The proper index form of this exponent would be73