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A066621
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Concatenation of triangular numbers in increasing order up to the n-th and then in decreasing order.
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1, 131, 13631, 13610631, 136101510631, 1361015211510631, 13610152128211510631, 136101521283628211510631, 1361015212836453628211510631, 13610152128364555453628211510631
(list; graph; refs; listen; history; internal format)
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