142905

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 36.at n=20A031714
• Number of ordered quadruples (i,j,k,l) in range [0..n] satisfying i == j (mod 2), j == k (mod 3) and k == l (mod 4).at n=42A115523
• a(n) = 441*n^2 + 21.at n=18A158603
• Triangular array T(n, k) read by rows: polynomials for the series expansion of the iterated function F^{t}(x) = Sum_{n>=0} (1/x)^(2*n-1)*P_n(t)/n! with F^{1}(x) = (x + sqrt(x^2 + 4))/2 and F^{2}(x) = F^{1}(F^{1}(x)). Row n of the triangle give the coefficients of the polynomial P_n(t).at n=31A390822