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 2021-02-27, 07:39 #1215 sweety439   Nov 2016 2,819 Posts Riesel base 185 Code: 1,0 2,2 3,1 4,1 5,4 6,1 7,1 8,8 9,(partial algebra factors) 10,6783 11,4 12,8 13,1 14,4 15,2 16,3 With CK=17 All k where k = m^2 and m = = 3 or 5 mod 8: for even n let k = m^2 and let n = 2*q; factors to: (m*185^q - 1) * (m*185^q + 1) odd n: factor of 2 This includes k = 9 k=10 prime given by CRUS k = 1 remain at n=66337, see post https://mersenneforum.org/showpost.p...&postcount=225