36448

Appears in sequences

• Numerator of n*(n-2)*(2*n-1)/(2*(n-1)).at n=32A022997
• Numbers n such that 5*10^n + 4*R_n + 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=23A103016
• Series reversion of x*c(x)/(1 - 2*x), c(x) the g.f. of A000108.at n=9A136576
• Molecular topological indices of the crown graphs.at n=16A192796
• Nonunitary near-perfect numbers: k such that nusigma(k) = k + d where d is a nonunitary divisor of k.at n=23A362969