Journal of Integer Sequences, Vol. 12 (2009), Article 09.3.1

On Positive Integers n with a Certain Divisibility Property


Florian Luca
Instituto de Matemáticas
Universidad Nacional Autónoma de México
C. P. 58089
Morelia, Michoacán
México

Vicentiu Tipu
Department of Mathematics
University of Toronto
Toronto, Ontario, M5S 2E4
Canada

Abstract:

In this paper, we study the positive integers n having at least two distinct prime factors such that the sum of the prime factors of n divides 2n-1 - 1.

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(Concerned with sequence A156787.)

Received December 15 2008; revised version received February 20 2009. Published in Journal of Integer Sequences, February 23 2009.

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