A389954 Numbers k such that phi(k) = pi(k) + Omega(k).

5, 9, 15, 22, 28, 32, 40, 78

Offset

1,1

Links

Table of n, a(n) for n=1..8.

Example

28 is in the sequence since phi(28) = 12 = 9 + 3 = pi(28) + Omega(28).

Mathematica

Select[Range[100], EulerPhi[#] == PrimePi[#] + PrimeOmega[#] &] (* Amiram Eldar, Oct 20 2025 *)

Crossrefs

Cf. A000010, A000720, A001222, A388000.

Sequence in context: A179187 A315080 A315081 * A075343 A212865 A102176

Adjacent sequences: A389951 A389952 A389953 * A389955 A389956 A389957

Keyword

nonn,hard,more

Author

S. I. Dimitrov, Oct 20 2025

Status

approved