42922

Appears in sequences

• Numbers k such that sigma(k) = sigma(k+4).at n=33A015863
• a(n) = a(n-1) + a(n-3) + a(n-4) + a(n-5) + a(n-7).at n=22A107480
• The number of different 4-colorings for the vertices of all triangulated planar polygons on a base with n vertices if the colors of two adjacent boundary vertices are fixed.at n=9A174395
• n/2 analog of Keith numbers.at n=7A282766
• Expansion of e.g.f. exp(2*x) / (1 - x*exp(x)).at n=6A368265