134215680

Appears in sequences

• Number of degree-n irreducible polynomials over GF(2); number of n-bead necklaces with beads of 2 colors when turning over is not allowed and with primitive period n; number of binary Lyndon words of length n.at n=32A001037
• Largest solution of phi(x) = 2^n.at n=25A058215
• a(n) = (1/n) * Sum_{ d divides n } mu(n/d) * (2^d - 1).at n=31A059966
• Number of orbits of length n in map whose periodic points are A000051.at n=31A060477
• Related to sums of the n-th roots of unity: sums in a circular wedge (excluding the origin).at n=31A107847
• Inverse Euler transform of central binomial coefficients A000984.at n=16A131764