24571871

Appears in sequences

• Composite numbers k such that phi(k) = phi(k-1) + phi(k-2).at n=26A065572
• Unitary phibonacci numbers: solutions k of the equation uphi(k) = uphi(k-1) + uphi(k-2), where uphi(k) is the unitary totient function (A047994).at n=7A292033
• Infinitary phibonacci numbers: solutions k of the equation iphi(k) = iphi(k-1) + iphi(k-2) where iphi(k) is an infinitary analog of Euler's phi function (A091732).at n=24A332971