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A119146
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Triangular numbers composed of digits {1,7,8}.
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2
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1, 78, 171, 1711, 8778, 11781, 887778, 1188111, 18111171, 71778171, 88877778, 811178781, 7781717881, 8888777778, 181877771881, 887788118778, 888887777778, 88877878118778, 88888877777778, 181887881178871
(list; graph; refs; listen; history; internal format)
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