50470

Appears in sequences

• a(n) = Sum_{k=1..n, gcd(n,k) = 1} k^4.at n=13A053820
• a(1)=0; thereafter a(2k)=k+a(k), a(2k+1)=k+a(6k+4).at n=46A271473
• a(n) = Sum_{1 <= j <= n/2, gcd(j,n)=1} j^4.at n=27A295576