@article{bwmeta1.element.bwnjournal-article-cmv74i1p1bwm,
author = {Graeme Cohen},
title = {On a conjecture of M\k akowski and Schinzel},
journal = {Colloquium Mathematicae},
volume = {72},
year = {1997},
pages = {1-8},
zbl = {0888.11005},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-cmv74i1p1bwm}
}
Cohen, Graeme. On a conjecture of Mąkowski and Schinzel. Colloquium Mathematicae, Tome 72 (1997) pp. 1-8. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-cmv74i1p1bwm/
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[001] [2] M. Filaseta, S. W. Graham and C. Nicol, On the composition of σ(n) and ϕ(n), unpublished; S. W. Graham, M. Filaseta and C. Nicol, On σϕ(n) (Preliminary Report), Abstracts Amer. Math. Soc. 13.4 (1992), 357.
[002] [3] R. K. Guy, Unsolved Problems in Number Theory, 2nd ed., Springer, New York, 1994. | Zbl 0805.11001
[003] [4] G. H. Hardy, A Course of Pure Mathematics, Cambridge Univ. Press, 1960.
[004] [5] A. Mąkowski and A. Schinzel, On the functions ϕ(n) and σ(n), Colloq. Math. 13 (1964/65), 95-99.
[005] [6] C. Pomerance, On the composition of the arithmetic functions σ and ϕ, ibid. 58 (1989), 11-15.