A078769 n.phi(n)^2<sigma(n)^2.

2, 3, 4, 6, 8, 10, 12, 14, 18, 20, 24, 30, 36, 42, 48, 60, 84, 90, 120

Offset

0,1

Links

Table of n, a(n) for n=0..18.

Example

8*phi(8)^2=128, sigma(8)^2=225

Prog

(PARI) for (n=1, 1000, if (eulerphi(n)^2*n<sigma(n)^2, print1(n", ")))

Crossrefs

Cf. A064375.

Sequence in context: A126794 A011862 A122957 * A064375 A037229 A351740

Adjacent sequences: A078766 A078767 A078768 * A078770 A078771 A078772

Keyword

nonn

Author

Jon Perry, Jan 09 2003

Status

approved