MathSciNet bibliographic data MR157928 (28 #1156) 10.06 (10.03) Riesel, Hans Note on the congruence $a\sp{p-1}=1$$a\sp{p-1}=1$ $({\rm mod}$$({\rm mod}$ $p\sp{2})$$p\sp{2})$. Math. Comp. 18 1964 149–150. Article

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