244919

Appears in sequences

• Expansion of Product_{k>=1} (1 + x^k) * (1 + x^(2*k)) * (1 + x^(3*k)) * (1 + x^(4*k)) * (1 + x^(5*k)).at n=43A327047
• a(n) = Sum_{k = 1..n} ( n/gcd(k, n) )^4.at n=13A372965