22078

Appears in sequences

• a(n) = 2*a(n-1) + a(n-2) - a(n-4) - a(n-5) - a(n-6) - a(n-7).at n=11A019486
• a(n) is number of solutions of the equation sigma(x)=10^n.at n=28A110078
• Number of unrooted 3-regular planar maps with 2n vertices, up to orientation-preserving isomorphisms.at n=5A112948
• Indices n such that A134204(n) < n.at n=31A133242
• Numbers n such that A182134(n) = 3, i.e., there exist only three primes p with prime(n) < p < prime(n)^(1 + 1/n).at n=43A246781
• Numbers k such that 3*R_k - 20 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=15A256772
• Number of maximal matchings in the n-dipyramidal graph.at n=18A297064
• Expansion of 1/( (1-x)^2 * (1-x-9*x^3) )^(1/3).at n=14A383604