327424domain: NAppears in sequencesStarts of runs of exactly 6 consecutive nonsquarefree numbers.at n=28A049535Binomial transform of A081250.at n=9A084213Numbers k such that k = 6*phi(k) - sigma(k).at n=2A136539sigma(n) is an additive inverse of n modulo phi(n).at n=24A235989