Zentralblatt MATH
Publications of (and about) Paul Erdös
Zbl.No: 536.10007
Autor: Erdös, Paul; Guy, R.K.; Selfridge, J.L.
Title: Another property of 239 and some related questions. (In English)
Source: Numerical mathematics and computing, Proc. 11th Manitoba Conf., Winnipeg/Manit. 1981, Congr. Numerantium 34, 243-257 (1982).
Review: [For the entire collection see Zbl 532.00008.]
Regarding the decomposition n! = a1a2...ak of n! into k factors the authors prove the following three interesting theorems:
Theorem 1. If n > 239 there is no factorization with n < a1 < a2 < ... < ak \leq 2n.
Theorem 2. For every n > 13 there is a factorization with n < a1 \leq a2 \leq ... \leq ak \leq 2n.
Theorem 3. Let f(n) denote the smallest integer ak for which there exists a factorization with n < a1 < a2 < ... < ak. Then there are constants 0 < c1 < c2 such that 2n+c1 n/ log n < f(n) < 2n+c2 n/ log n. Besides they ask many interesting open questions.
Reviewer: K.Ramachandra
Classif.: * 11A25 Arithmetic functions, etc.
11A41 Elemementary prime number theory
05A10 Combinatorial functions
Keywords: factors of n factorial
Citations: Zbl 532.00008
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