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23:09 Jan 12, 2008
This question was closed without grading. Reason: No acceptable answer
English to Spanish translations [PRO] Science - Mathematics & Statistics
English term or phrase:doubly triangular numbers
I'm translating a Wikipedia article:
Since 36 is both square and triangular, 666 is the sixth number of the form n2(n2 + 1) / 2 and the eighth number of the form n(n + 1)(n2 + n + 2) / 8 (****doubly triangular numbers*****).