19210

Appears in sequences

• a(n) = C(n,5) + C(n,4) - C(n,3) + 1, n >= 7.at n=14A005288
• Quadruples of different integers from [ 1,n ] with no common factors between pairs.at n=44A015623
• Numerators of continued fraction convergents to sqrt(354).at n=6A041670
• a(n) = 25*n^2 - 14*n + 2.at n=28A154357
• Number of ways to place zero or more nonadjacent 0,0 1,0 1,1 2,0 2,2 3,0 3,3 polyhexes in any orientation on a planar nXnXn triangular grid.at n=8A155316
• Number of reduced words of length n in the Weyl group A_17.at n=5A161497
• a(n) = floor(sqrt(2*n^5)).at n=45A172473
• Number of seven-prime Carmichael numbers less than 10^n.at n=15A174615
• Least integer b>2n+1 such that the numbers written as [1,3,...,2n-1,2n+1] and [2n+1,2n-1,...,3,1] in base b are both prime.at n=35A218465
• Sum of the second largest parts of the partitions of 4n into 4 parts.at n=13A241084
• Numbers k that are the product of four distinct primes such that x^2+y^2 = k has integer solutions.at n=31A248712
• a(n) is the smallest position k >= 1 on the diagonal at which a record gap of size n between two adjacent Dyck paths of the symmetric representation of sigma starts.at n=10A319139
• a(n) = A007678(2*n)/(2*n).at n=39A341734