28512

Appears in sequences

• Coordination sequence for 4-dimensional cubic lattice (points on surface of 4-dimensional cross-polytope).at n=22A008412
• Coordination sequence for C_4 lattice.at n=11A019560
• Composite numbers divisible by the palindromic sum of their palindromic prime factors (counted with multiplicity).at n=24A046366
• Numbers formed by interpreting the reduced residue set of every even number as a Zeckendorf Expansion.at n=10A054433
• McKay-Thompson series of class 27A for the Monster group.at n=35A058599
• Number of orbits of length n in map whose periodic points are A059928.at n=58A060478
• Triangle read by rows: T(n, k) = [z^k] P(n, z) where P(n, z) = Sum_{k=0..n} binomial(n, k) * Pochhammer(n - k + c, k) * z^k / k! and c = 4.at n=52A062145
• Numbers k such that Omega(k) = Omega(k+1) + Omega(k+2) + Omega(k+3) + Omega(k+4) where Omega(k) denotes the number of prime factors of k, counting multiplicity.at n=26A078094
• Number of n X n symmetric positive definite matrices with 2's on the main diagonal and -1's and 0's elsewhere.at n=6A084552
• a(n) = binomial(n+7,7) * binomial(n+10,7).at n=2A105943
• a(n) = binomial(n+2,2)*binomial(n+5,5).at n=7A107417
• Smallest k such that phi(x) = k has exactly n odd solutions.at n=42A130669
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (0, 1, 0), (1, 0, 1), (1, 1, -1), (1, 1, 1)}.at n=7A151208
• The number of ways one can flip seven consecutive tails (or heads) when flipping a coin n times.at n=19A151975
• Numbers k such that phi(tau(k)) = sopf(k).at n=33A173326
• Numbers k such that rad(k)^2 divides sigma(k).at n=10A173615
• Triangle T(n, k, q) = (q+1)*binomial(n, k)*(Pochhammer(q+1, n)/(Pochhammer(q+1, k)*Pochhammer(q+1, n-k))), with T(n, 0) = T(n, n) = 1, and q = 2, read by rows.at n=60A174125
• Numbers with prime factorization pq^4r^5.at n=4A190468
• a(n) = 22*n^2.at n=36A195323
• Permanent of the n-th principal submatrix of A204269.at n=10A204422