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A119044
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Numbers n such that the n-th triangular number contains only digits {0,1,7}.
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2
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1, 4, 18, 58, 59, 141, 471418, 185310604, 451023506, 1184061400, 1844511706, 4474395400, 14266749459, 18444896915, 48521543066, 11838218371106, 39270880053981
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