38040

Appears in sequences

• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 26.at n=14A031704
• Numbers k whose decimal representation, read as a base-12 value and divided by k, yields an integer.at n=27A032555
• Number of n-element unlabeled ordered T_0-antichains; T_1-hypergraphs (with empty hyperedge but without multiple hyperedges) on n labeled nodes.at n=4A059052
• a(n) = 1728*n + 24.at n=21A157325
• a(n) = 40*(200*n - 49).at n=4A157652
• a(n) = 225*n^2 + 15.at n=13A158557
• a(n) = 169*n^2 + n.at n=14A173275
• The Wiener index of the Dutch windmill graph D(5,n) (n>=1).at n=39A180579
• Number of (n+3) X 4 0..2 matrices with each 4 X 4 subblock idempotent.at n=10A224721
• Numbers n such that sigma(sigma(n)) = sigma(sigma(n)-n) + sigma(n); that is, f(g(n)) = g(f(n)) where f = A000203 and g = A001065.at n=1A291881
• Expansion of e.g.f. exp((sin(x) + sinh(x))/2).at n=13A306347
• Number of sets of subsets of {1..n} covering all n vertices whose dual is a (strict) antichain, also called covering T_1 sets of subsets.at n=4A326960
• a(0) = 1; a(n) = Sum_{k=0..floor((n-1)/4)} binomial(n-1,4*k) * a(k) * a(n-4*k-1).at n=13A351969