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A119105
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Triangular numbers composed of digits {1,2,7}.
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2
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1, 21, 171, 1711, 2211, 72771, 121771, 222111, 712221, 22221111, 72222171, 2222211111, 12177127711, 72177771711, 171277217121, 222222111111, 22222221111111, 121727717277211, 2222222211111111, 22117121117271271
(list; graph; refs; listen; history; internal format)
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