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@article{Shippee1978,
	author={D. E. Shippee},
	title={Four new factors of {F}ermat numbers},
	abstract={From the review (no abstract): The author states that $(297·2^{64}+1)|F_{62}$,
		$(7551·2^{69}+1)|F_{66}$, $(683·2^{73}+1)|F_{71}$, and $(1421·2^{93}+1)|F_{91}$.
		The author tested numbers of the form $K·2^n+1$ in the ranges $23\leq n\leq
		100$, $3\leq K\leq 29999$, $K$ odd; and $101\leq n\leq 256$, $101\leq K\leq
		293$, $K$ odd. },
	journal= MC,
	volume= 32,
	year= 1978,
	pages={941},
	number={143}
}