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 2021-02-25, 22:29 #1197 sweety439   Nov 2016 2,819 Posts Riesel base 169 Code: 1,(full algebra factors) 2,1 3,2 4,(full algebra factors) 5,1 6,1 7,1 8,1 9,(full algebra factors) 10,1 11,1 12,1 13,2 14,2 15,1 With CK=16 All k = m^2 for all n; factors to: (m*13^n - 1) * (m*13^n + 1) This includes k = 1, 4, 9 Conjecture proven