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A119230
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Triangular numbers composed of digits {6,7,8}.
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2
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6, 66, 78, 666, 6786, 8778, 676866, 887778, 88877778, 8888777778, 888887777778, 7768686676878, 68886888677778, 88888877777778, 8888888777777778, 888888887777777778, 88888888877777777778, 8888888888777777777778
(list; graph; refs; listen; history; internal format)
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