Talk:Cullen number
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[edit] weak property
It migt be true, that a Cullen number Cp is divisible by 2p-1, if p is a prime and p = 8k − 3. But there exist other Cp is divisible by 2p-1, where p is not equal to 8k-3. At last there exist n there neither prime nor of the form 8k-1, but Cn is divisble by 2n-1.
n c(n) 2n-1 8k-3 d/n ---------------------------- 1 3 1 d 2 9 3 d 3 25 5 1 d 4 65 7 n 5 161 9 n 6 385 11 d 7 897 13 2 d 8 2049 15 n 9 4609 17 n 10 10241 19 d 11 22529 21 n 12 49153 23 d
I think, this is a very weak property. --Arbol01 18:07, 11 Feb 2005 (UTC)
