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A131997
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Array read by rows in which the n-th row contains odd numbers of all possible prime signatures with n divisors.
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0
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1, 3, 9, 27, 15, 81, 243, 45, 729, 2187, 135, 105, 6561, 225, 19683, 405, 59049, 177147, 1215, 315, 675
(list; graph; refs; listen; history; internal format)
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