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Popular values of Euler’s function. (English) Zbl 0437.10001


MSC:

11A25 Arithmetic functions; related numbers; inversion formulas
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Online Encyclopedia of Integer Sequences:

Number of solutions to phi(k) = 2n.

References:

[1] Erdös, Publ. Math. Debrecen 4 pp 201– (1956)
[2] DOI: 10.1093/qmath/os-6.1.205 · JFM 61.0129.05 · doi:10.1093/qmath/os-6.1.205
[3] de Bruijn, Nederl. Akad. Wetensch. Proc. Ser 38 pp 239– (1966) · doi:10.1016/S1385-7258(66)50029-4
[4] Bateman, Acta Arith 21 pp 329– (1972)
[5] Erdös, Mathematika 23 pp 1– (1976)
[6] DOI: 10.2307/2038881 · Zbl 0254.10009 · doi:10.2307/2038881
[7] Hooley, Mathematika 20 pp 135– (1973)
[8] Hardy, An introduction to the theory of numbers (1960) · Zbl 0086.25803
[9] Goldfeld, Mathematika 16 pp 23– (1969)
[10] DOI: 10.2307/2042994 · Zbl 0386.10004 · doi:10.2307/2042994
This reference list is based on information provided by the publisher or from digital mathematics libraries. Its items are heuristically matched to zbMATH identifiers and may contain data conversion errors. In some cases that data have been complemented/enhanced by data from zbMATH Open. This attempts to reflect the references listed in the original paper as accurately as possible without claiming completeness or a perfect matching.