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A119109
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Triangular numbers composed of digits {1,2,9}.
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2
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1, 21, 91, 2211, 222111, 22221111, 229119121, 291212911, 2222211111, 222222111111, 299992122991, 1122921211191, 22222221111111, 2222222211111111, 21212929921912191, 222222222111111111
(list; graph; refs; listen; history; internal format)
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