A079541 Numbers n such that phi(n) = d(n).

1, 3, 8, 10, 18, 24, 30

Offset

1,2

Comments

Duplicate of A020488. - Peter Luschny, Aug 26 2011

References

D. S. Mitrinovic et al., Handbook of Number Theory, Kluwer, p. 11.

Links

Table of n, a(n) for n=1..7.

Mathematica

Select[Range[500], EulerPhi[#]==DivisorSigma[0, #]&] (* Harvey P. Dale, Jun 18 2011 *)

Crossrefs

Cf. A000010, A000005, A063070.

Sequence in context: A261929 A020488 A064435 * A283757 A353078 A131725

Adjacent sequences: A079538 A079539 A079540 * A079542 A079543 A079544

Keyword

dead

Author

N. J. A. Sloane, Jan 23 2003

Extensions

Corrected by Harvey P. Dale, Jun 18 2011

Status

approved