0
Anonymous
99, 198, 297, 396, 495, 594, 693, 792 +99 . . .
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1, 2, 3, 6, 9, 11, 18, 22, 33, 66, 99, 198.
9 - 11 January 2013
It is 88.
19
9 is the composite number. the factors are: 1,3 and 9. all the rest are prime.