64051

Appears in sequences

• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 91 ones.at n=0A031859
• Expansion of the exponential series exp( x * T(x) ) = exp( x / sqrt(1 - 2*x - 3*x^2) ), where T(x) is the ordinary generating series of the central trinomial coefficients (A002426).at n=6A080896
• Expansion of (1+x+x^2)/((1-x^2)*(1-2*x-x^2)); a Pellian-related sequence.at n=12A114697
• Indices of triangular numbers (A000217) that are also decagonal (A001107).at n=7A133218
• Numbers k such that 2 * A000217(k) + 1 is triangular.at n=13A216134
• Sequences A006452 and A216134 interlaced.at n=27A216162
• a(n) is the number of regions into which three-dimensional Euclidean space is divided by n-1 planes parallel to each face of a regular tetrahedron with edge length n, dividing the edges into unit segments.at n=25A364401