23449

Appears in sequences

• Number of polyominoes with n cells that tile the plane.at n=11A054359
• Constant term of the reduction by x^2->x+1 of the polynomial p(n,x) defined at Comments.at n=18A192964
• Odd composite numbers n, such that n, n+d, n*d and n/d are all odious (A000069) for every divisor d of n.at n=36A231558
• Number of length 3+1 0..n arrays with the sum of the maximum of each adjacent pair multiplied by some arrangement of +-1 equal to zero.at n=35A250647
• Semiprimes whose prime factors are of equal binary length and which differ from each other in exactly two bit positions.at n=47A261074
• Expansion of Product_{k>=1} 1 / (1 - k*x^k)^k.at n=11A266941
• Number of 3-tuples of nonnegative integers less than p for which 3-argument multinomial coefficients support a Lucas congruence modulo p^2, where p is the n-th prime.at n=14A348885
• Numbers k such that k and k+2 are both A000120-perfect numbers (A175522).at n=27A360639