18592

Appears in sequences

• Almost trivalent maps.at n=2A002009
• Numbers k such that k divides the (right) concatenation of all numbers <= k written in base 25 (most significant digit on right).at n=21A029518
• Numbers whose base-4 representation contains exactly four 0's and three 2's.at n=30A045060
• Numbers k such that 9*10^k + R_k is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=10A056726
• <h[d,d],s[d,d]*s[d,d]*s[d,d]> where h[d,d] is a homogeneous symmetric function, s[d,d] is a Schur function indexed by two parts, * represents the Kronecker product and <, > is the standard scalar product on symmetric functions.at n=36A115375
• A musically inspired Titius-Bode-like sequence based on the geometric division of 4- and 5-dimensional space: Z_(n+1) = 3 * (C(n-1, 0) + C(n-1, 1) + C(n-1, 2) + C(n-1, 3) + C(n-1, 4) + C(n-1, 5)*A059620(n+6)) + 4.at n=21A209257
• Irregular triangle read by rows: row n consists of the coefficients of the expansion of the polynomial (2*x + 2)^n + (x^2 - 1)*(x + 2)^n.at n=56A300184
• Numbers k such that 315*2^k+1 is prime.at n=45A322949
• Array read by descending antidiagonals: A(n,k) is the number of oriented colorings of the edges of a regular n-dimensional simplex using up to k colors.at n=24A327083
• Number of oriented colorings of the edges (or triangular faces) of a regular 4-dimensional simplex with n available colors.at n=3A331350
• Array read by descending antidiagonals: T(n,k) is the number of oriented colorings of the triangular faces of a regular n-dimensional simplex using k or fewer colors.at n=17A337883
• Numbers k such that k and 4k, taken together, contain all digits 1 though 9 at least once.at n=30A346135
• a(n) = A347961(A276086(n)), where A347961 is Dirichlet convolution of A342001 with itself.at n=57A347962
• Expansion of g.f. A(x) satisfying 0 = Sum_{n=-oo..+oo} x^n * A(x)^n * (2 - x^(n-1))^(n+1).at n=7A366732
• a(n) is the number of ways to select three distinct points of an n X n grid forming a triangle whose sides do not pass through a grid point.at n=8A372218
• E.g.f. satisfies A(x) = exp( 2 * x * exp(x) * A(x)^(1/2) ).at n=5A380406