2010Journal of Zhejiang University(Science Edition)Requires access

Some new solutions of the congruence 2~(n-2)≡1(mod n)

Yang Shi-chun

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Abstract

In 1991,all solutions of the congruence 2n-2≡1(mod n) up to 1011have been presented by Sinisalo M.K,and all 88 solutions in the interval [3,1011] have been tabulated and,only 6 final decimal digit 9 have been obtained.It is proved that there does not exist any solution n3.462*1014 for congruence 2n-2≡1(mod n) having square divisors.By using a new method,it has been found that there exist 9 solutions for congruence 2n-2≡1(mod n) having square divisors.By using the same method,the new solutions n of the congruence 2n-2≡1(mod n),where n1011 have been tabulated.

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What this paper is about

In 1991,all solutions of the congruence 2n-2≡1(mod n) up to 1011have been presented by Sinisalo M.K,and all 88 solutions in the interval [3,1011] have been tabulated and,only 6 final decimal digit 9 have been obtained.It is proved that there does not exist any solution n3.462*1014 for congruence 2n-2≡1(mod n) having square divisors.By using a new method,it has been found that there exist 9 solutions for congruence 2n-2≡1(mod n) having square divisors.By using the same method,the new solutions n of the congruence 2n-2≡1(mod n),where n1011 have been tabulated.

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Available abstract

In 1991,all solutions of the congruence 2n-2≡1(mod n) up to 1011have been presented by Sinisalo M.K,and all 88 solutions in the interval [3,1011] have been tabulated and,only 6 final decimal digit 9 have been obtained.It is proved that there does not exist any solution n3.462*1014 for congruence 2n-2≡1(mod n) having square divisors.By using a new method,it has been found that there exist 9 solutions for congruence 2n-2≡1(mod n) having square divisors.By using the same method,the new solutions n of the congruence 2n-2≡1(mod n),where n1011 have been tabulated.

Key concepts: Congruence (geometry), Mod, Mathematics, Congruence relation, Combinatorics, Decimal, Arithmetic, Discrete mathematics

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