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A119097
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Triangular numbers composed of digits {1,2,3}.
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2
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1, 3, 21, 231, 2211, 3321, 21321, 32131, 222111, 232221, 11132121, 22221111, 22321221, 2222211111, 2223211221, 12221332311, 222222111111, 222232111221, 1121113113121, 1231322213121, 22222221111111, 22222321111221
(list; graph; refs; listen; history; internal format)
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