What's the sum of the numbers in the next pair in this sequence?: (3, 2), (5, 2), (7, 3), (9, 2), (11, 3), (13, 3), (17, 2), (19, 3), (21, 3).
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The Python gympy2 module is meant for working with really big numbers. But it's also good for manipulating the bits in the binary representations of small numbers.
This problem suggested to me when I had difficulty 'seeing' a solution to one by someone called 'Lucy S' IIRC.