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A119088
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Numbers n such that the n-th triangular number contains only digits {0,6,7}.
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2
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3, 11, 36, 115, 363, 1095, 11576, 36624, 363504, 391576, 391588, 36333648, 123288823, 3660785999, 11014541352775, 39410677756315, 124633627940188
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