30486

Appears in sequences

• Becomes prime or 4 after exactly 9 iterations of f(x) = sum of prime factors of x.at n=26A048131
• Numbers k such that x^k + x^9 + 1 is irreducible over GF(2).at n=48A057479
• Binomial transform of A000960.at n=10A099063
• a(n) = n*(4*n^2 - 3*n + 5)/6.at n=35A174723
• Number of nX7 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,1,3,4 for x=0,1,2,3,4.at n=8A195977
• Number of non-equivalent (mod D_3) ways to arrange 3 indistinguishable points on a triangular grid of side n so that no three points are collinear.at n=12A234351
• First members C of two non-consecutive numbers such that the sums of their cubes are equal to centered cube numbers and to at least one other sum of two cubes, i.e., A = B^3 + (B+1)^3 = C^3 + D^3 = E^3 + F^3.at n=11A352222