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A119224
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Triangular numbers composed of digits {5,7,8}.
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2
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55, 78, 5778, 7875, 8778, 75855, 887778, 7575778, 55888878, 57775875, 87787875, 88877778, 5587777755, 8888777778, 787575878775, 888887777778, 8857787887578, 88888877777778, 5777878558877778, 8888888777777778
(list; graph; refs; listen; history; internal format)
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