84177

Appears in sequences

• Numbers k such that w(k-2), w(k-1), and w(k) are all odd, where w is A336957.at n=31A338070
• a(n) = Sum_{i=1..n} Sum_{j=1..n} Sum_{k=1..n} phi(i*j*k) / phi(j*k).at n=20A372663