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A119139
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Numbers k such that the k-th triangular number contains only digits {1,5,9}.
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2
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1, 5, 10, 13, 34, 101, 109, 138, 1738, 10114, 19794, 1011090, 1019010, 1054130, 1091010, 34406858, 178858133, 565606858, 4289521091010, 55841058721258
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OFFSET
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1,2
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COMMENTS
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Next term exceeds 1.4*10^16.
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LINKS
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CROSSREFS
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KEYWORD
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nonn,base,more
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AUTHOR
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STATUS
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approved
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