56799

Appears in sequences

• Numbers k such that sigma(k-3) + sigma(k+3) = sigma(2*k).at n=36A067129
• a(n) = a(n-1)+a(n-2)+a(n-3)+2*a(n-4), a(0)=1, a(1)=3, a(2)=7, a(3)=15.at n=15A139806