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==References==
* Z. I. Borevich and I. R. Shafarevich, ''Number Theory''. Academic Press, NY, 1966, pp. 425–430.
* {{cite book | author = D. A. Cox
* L. Euler, "[https://arxiv.org/abs/math/0507352 An illustration of a paradox about the idoneal, or suitable, numbers]", 1806
* G. Frei, Euler's convenient numbers, Math. Intell. Vol. 7 No. 3 (1985), 55–58 and 64.
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