19811

Appears in sequences

• Divisors of 2^50 - 1.at n=21A003554
• Number of necklaces with 6 black beads and n-6 white beads.at n=24A032191
• Denominators of continued fraction convergents to sqrt(116).at n=11A041211
• Denominators of continued fraction convergents to sqrt(464).at n=11A041885
• Starting positions of strings of three 5's in the decimal expansion of Pi.at n=16A083620
• Squarefree conductors of quintic fields.at n=17A085715
• Number of elements of a Weyl group of order 2^{n-1} n! of type D for which a reduced word contains all of the simple reflections.at n=4A112225
• Table T(n,k) of number of elements of Weyl group of type D of order 2^{n-1} n! such that a reduced word uses exactly n-k distinct simple reflections 0 <= k <= n, n>=1.at n=21A112226
• Semiprimes in A033951.at n=21A113691
• Number A(n,k) of necklaces with n white beads and k*n black beads; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=61A261494
• Number of necklaces with n white beads and 4*n black beads.at n=6A261498
• p-INVERT of the positive integers, where p(S) = 1 - S - S^4.at n=9A290898