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A119117
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Triangular numbers composed of digits {1,3,7}.
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2
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1, 3, 171, 1711, 1717731, 17131731, 1313137337331, 117717311713137711, 773113771333731171, 3773733771711731311, 177177371373713177137131, 311733717173773173111771, 3311337711173711371777131
(list; graph; refs; listen; history; internal format)
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