1014751

Appears in sequences

• a(n) = n^4 - n^3 - n^2 - n - 1.at n=32A125082
• a(n) = Sum_{d|n} (-1)^(n/d+1)*d^5.at n=15A284926
• a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} n/gcd(x_1, x_2, x_3, x_4, n).at n=15A372961