87857

Appears in sequences

• Recip transform of 2*(1 + x^2 + x^5)-1/(1-x).at n=13A049156
• a(n) = 76*n^2 + 1.at n=34A158767
• a(n) = Sum_{1 <= x_1, x_2, x_3 <= n} ( gcd(x_1, n)/gcd(x_1, x_2, x_3, n) )^2.at n=16A371492