110809

Appears in sequences

• Sum of proper divisors minus the number of proper divisors of Fibonacci number A000045(n).at n=23A152990
• a(0)=0, a(1)=1, a(2n)=18*a(n), a(2n+1)=a(2n)+1.at n=25A197352
• Expansion of (x^5-2*x^4+2*x^3-x+1)/(x^4-2*x^3+3*x^2-3*x+1).at n=20A271827