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Least triangular number representable as a sum of n consecutive triangular numbers, or -1 if no such triangular number exists.
+10
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0, 1, 10, 10, 55, -1, 210, 120, 120, 1485, 2145, -1, 2080, -1, -1, 56616, 1326, 12561, -1, 1540, 1540, 21736, -1, -1, 52650, 16653, 4950, 26796, 10440, 12880, 7750, -1, -1, 7140, 7140, 154290, -1, 11476, -1, 214840, -1, -1, 207690, 23252790, -1, -1, 6895041, -1, 750925
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