1 + 2 + 4 + 5 + 10 + 13 + 20 + 25 + 26 + 50 + 52 + 65 + 100 + 130 + 260 + 325 + 650 + 1300 = 3,038
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23 x 52 = 200
It is: 2*3*17 =102 and exponents not needed
28 = 22 x 71
2 x 3 x 5 x 19 No exponents required.
Think of the "ex" in index as meaning exponent. Write the prime factorization with exponents. 216 = 23 x 33