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A111298
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Add the digits of the first number to give the second; the first number multiplied by the second gives the third. The third number becomes the first in a new "set" of three.
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15, 6, 90, 9, 810, 9, 7290, 18, 131220, 9, 1180980, 27, 31886460, 36, 1147912560, 36, 41324852160, 36, 1487694677760, 72, 107114016798720, 54, 5784156907130880, 72, 416459297313423360, 72, 29985069406566481920, 99, 2968521871250081710080
(list; graph; refs; listen; history; internal format)
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