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@article{Loh89,
	author={G. L{\"o}h},
	title={Long Chains of Nearly Doubled Primes},
	abstract={A chain of nearly doubled primes is an ordered set $\{ a_1, a_2, . . . ,
		p_\lambda \}$ of prime numbers, interlinked by $a_k = 2 a_(k-1) \pm 1$.
		A search for long chains of this kind has been performed in the range $a_1
		\lt 2^50$. Chains of length up to 13 have been found. Shorter chains have
		been counted in some restricted ranges. Some of these counts are compared
		with the frequencies predicted by a quantitative version of the prime $k$-tuple
		conjecture.},
	journal= mc,
	volume= 53,
	year= 1989,
	pages={751-759},
	mrnumber={90e:11015 },
	annote={Chains of primes for which each is either twice the proceeding one plus
		one, or each is either twice the proceeding one minus one. See also \cite[section
		A7]{Guy94}.}
}