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8 = 2^3 is the only possible cube "centered and sandwiched" in the middle of two pairs of twins (3,5) and (11,13). That is to say 2^3=8=(3+13)/2=(5+11)/2. [Rivera]

Submitted: 2020-06-07 17:07:43;   Last Modified: 2020-06-08 19:03:40.
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