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| * 2^n-1 where n is odd * 2^n+1 where n is odd * 2^n+1 where n=4k-2 |
* $b^n \pm 1$ for $b = 2, 3, 5, 6, 7, 10, 11, 12$ and large exponents n [http://homes.cerias.purdue.edu/~ssw/cun/index.html] * $a^n \pm 1$ for $a ≤ 13$ and $a$ not a perfect number [http://wwwmaths.anu.edu.au/~brent/factors.html] |
b^n \pm 1 for b = 2, 3, 5, 6, 7, 10, 11, 12 and large exponents n [http://homes.cerias.purdue.edu/~ssw/cun/index.html]
a^n \pm 1 for a ≤ 13 and a not a perfect number [http://wwwmaths.anu.edu.au/~brent/factors.html]