25805

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted then there are a pair of central terms both equal to 10.at n=34A031423
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-1)/3.at n=17A048008
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-2)/3.at n=17A048019
• Number of nonempty subsets of {1,2,...,n} in which exactly 1/4 of the elements are <= (n-3)/3.at n=17A048030
• {(Product of terms in row n of A082817) + 1} / n.at n=4A082821
• Triangle T, read by rows, where column k of T = column 0 of matrix power T^(k+1) for k>0, with column 0 of T = unsigned column 0 of T^-1 (shifted).at n=29A152400
• Column 1 of triangle A152400; also, column 1 of square array A152405.at n=6A152401
• Square array, read by antidiagonals, where row n+1 is generated from row n by first removing terms in row n at positions {m*(m+1)/2, m>=0} and then taking partial sums, starting with all 1's in row 0.at n=29A152405
• Positions of those 1's that are followed by a 0, summed over all Fibonacci binary words of length n. A Fibonacci binary word is a binary word having no 00 subword.at n=13A152881
• Number of free poly-IH10-tiles (holes allowed) with n cells.at n=8A197549
• Numbers with 3 prime factors a < b < c such that 2c = a^4 + b^2.at n=4A261657
• The growth series for the affine Coxeter (or Weyl) group [3,3,5] (or H_4).at n=40A266783
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + n - 1, where a(0) = 1, a(1) = 2, b(0) = 3, and (a(n)) and (b(n)) are increasing complementary sequences.at n=17A294548
• Numbers m such that 2^m == -1/2 (mod m).at n=6A296369
• Numbers of the form p*q*r where p, q, r are distinct primes congruent to 1 mod 4 such that Legendre(p/q) = Legendre(p/r) = Legendre(q/r) = -1.at n=23A323271
• Number of binary necklaces of length n which have more 00 than 01 substrings.at n=16A371668