You multiply it by itself repeatedly.
For example, 37 = 3*3*3*3*3*3*3 = 2187
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Multiply the number by itself.
Twenty to the seventh power is 20 million (US), or 20,000,000.
The value of the seventh power of two is 128.
815*537 = 2.56*1039 in standard form Therefore it will have 40 digits.
The sum of the first six numbers is (6 x 19) = 114The sum of the new group of seven numbers is (7 x 20) = 140The seventh number is (140 - 114) = 26.==========================================The seventh number contains enough material to make itself 20and also to raise each of the previous six numbers from 19 to 20.Therefore it must be [ 20 + (6 x 1) ] = (20 + 6) = 26.