Colloquium Mathematicum > 2000 > 86 > 1 > 37-41
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journal ISSN : | 0010-1354 |
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Bibliography
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[1] J. Browkin and A. Schinzel, On integers not of the form n-ϕ(n), Colloq. Math. 68 (1995), 55-58.
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[2] P. Erdős, On integers of the form and related problems, Summa Brasil. Math. 2 (1950), 113-123.
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[3] R. K. Guy, Unsolved Problems in Number Theory, Springer, 1994.