46794domain: NAppears in sequencesNumbers n for which phi(n) = phi(n-1) - phi(n+1).at n=4A220160Numbers n for which the alternating sum of the digits of n^n is 0.at n=42A244212a(n) = Sum_{d|n} d^d * binomial(d+n/d-1, d).at n=5A343574