308430

Appears in sequences

• Expansion of q^(-1/3) * (eta(q^3) / eta(q))^4 in powers of q.at n=18A128758
• a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} sigma( n/gcd(x_1, x_2, x_3, n) ).at n=19A373130