121770

Appears in sequences

• Aliquot sequence starting at 966.at n=21A014363
• Fibonacci sequence beginning 0, 18.at n=20A022352
• Nonprime numbers k such that k | sigma_3(k) + phi(k)^3.at n=23A055970
• Consider recurrence b(0) = (2n+1)/4, b(n) = b(0)*ceiling(b(n-1)); sequence gives first integer reached (or -1 if no integer is ever reached).at n=18A081851
• Coefficient of x in the reduction by x^2->x+1 of the polynomial p(n,x)=1+x^(n+1)+x^(2n).at n=12A192475
• Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 or 00000101.at n=27A259768
• Composition of the g.f. of A086246 with itself.at n=12A348197