Size: 236
Comment:
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Size: 236
Comment:
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Deletions are marked like this. | Additions are marked like this. |
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* $b^n \pm 1 |
* $a^n \pm 1 |
an±1 fora=2,3,5,6,7,10,11,12 and large exponents n [http://homes.cerias.purdue.edu/~ssw/cun/index.html]an±1 fora≤13 anda not a perfect number [http://wwwmaths.anu.edu.au/~brent/factors.html]