42119

Appears in sequences

• Numbers k such that j(k)*phi(k) = sigma(phi(k)), j(k) = A033831(k).at n=31A033856
• Numbers n where either n or n+1 is divisible by the numbers from 1 to 12.at n=11A131662
• a(n) = Sum_{k=0..floor(n/3)} |Stirling1(n - 2*k,k)|.at n=11A357901