MathSciNet bibliographic data MR1627821 11D79 (11D88 11P05) Sekigawa, Hiroshi; Koyama, Kenji Nonexistence conditions of a solution for the congruence $x^k_1+\cdots+x^k_s\equiv N\pmod {p^n}$$x^k_1+\cdots+x^k_s\equiv N\pmod {p^n}$. Math. Comp. 68 (1999), no. 227, 1283–1297. Article

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