1215, 405,243,135,81,45,27,15,9,5,3,1
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1, 3, 5, 9, 15, 25, 27, 45, 75, 81, 135, 225, 243, 405, 675, 1215, 2025, 6075 3 and 5 are prime.
What number is closest to the sum of 467 1888 and 1215?
35 times 5
The prime factors are 2x2x2x13 All factors are 1,104,2,52,4,26,8,13
the answer is ........ factors are 1,2,3,6,9,18 ; 1x18,2x9,3x6 prime factors are 2x3x3