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Bibliography

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J. C. Morehead & A. E. Western, ``Note on Fermat's numbers,'' ibid, v. 16, 1909, p. 1-6. MR 1558828

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R. M. Robinson, ``Mersenne and Fermat numbers,'' Proc. Amer. Math. Soc., v. 5, 1954, p. 842-846. MR 0064787 (16:335d)

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R. M. Robinson, ``A report on primes of the form and on factors of Fermat numbers,'' ibid., v. 9, 1958, p. 673-681. MR 0096614 (20:3097)