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A119238
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Numbers n such that the decimal representation of n is contained as substring in that of the n-th triangular number.
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1
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1, 5, 19, 25, 199, 625, 1999, 2102, 5582, 9376, 9909, 10100, 16833, 19999, 41012, 55741, 74491, 83885, 88102, 90625, 151774, 199999, 201002, 558257, 626522, 740312, 798097, 810062, 890625, 1001000, 1030563, 1668333, 1999999, 2646751
(list; graph; refs; listen; history; internal format)
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