Geodesic
On integers not of the form n - φ (n)
Colloquium Mathematicum, Tome 68 (1995) no. 1, pp. 55-58 Cet article a éte moissonné depuis la source Institute of Mathematics Polish Academy of Sciences

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W. Sierpiński asked in 1959 (see [4], pp. 200-201, cf. [2]) whether there exist infinitely many positive integers not of the form n - φ(n), where φ is the Euler function. We answer this question in the affirmative by proving Theorem. None of the numbers $2^k·509203$ (k = 1, 2,...) is of the form n - φ(n).
DOI : 10.4064/cm-68-1-55-58

J. Browkin 1 ; A. Schinzel 1

1 
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J. Browkin; A. Schinzel. On integers not of the form n - φ (n). Colloquium Mathematicum, Tome 68 (1995) no. 1, pp. 55-58. doi: 10.4064/cm-68-1-55-58

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