**Largest triangular number less than or equal to n; write m-th triangular number m+1 times.**

*0, 1, 1, 3, 3, 3, 6, 6, 6, 6, 10, 10, 10, 10, 10, 15, 15, 15, 15, 15, 15, 21, 21, 21, 21, 21*

*2 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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