MathSciNet bibliographic data MR829641 (87e:11005) 11A07 Shen, Mok-Kong On the congruence $2\sp {n-k}\equiv 1\;({\rm mod}\,n)$$2\sp {n-k}\equiv 1\;({\rm mod}\,n)$. Math. Comp. 46 (1986), no. 174, 715–716. Article

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