Geodesic
On sparsely totient numbers
Glasgow mathematical journal, Tome 33 (1991) no. 3, pp. 350-358

Voir la notice de l'article provenant de la source Cambridge University Press

Following Masser and Shiu [6] we say that a positive integer n is sparsely totient ifHere φ is the familiar Euler totient function. We write F for the set of sparsely totient numbers. In [6] several results are proved about the multiplicative structure of F. If we write P(n) for the largest prime factor of n then it was shown (Theorem 2 of [6]) thatand infinitely often 
Harman, Glyn. On sparsely totient numbers. Glasgow mathematical journal, Tome 33 (1991) no. 3, pp. 350-358. doi: 10.1017/S0017089500008417
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