49762domain: NAppears in sequencesNumbers k such that sigma(k) = sigma(k+4).at n=35A015863Expansion of g.f. 2*x / ((1+x)^2*(1-2*x)^2).at n=12A095977Number of (u,v,w,x,y,z) with all terms in {0,1,...,n} and 5u=v+w+x+y+z.at n=11A212242E.g.f. A(x) satisfies A(x) = exp( 2 * x * A(x)^(1/2) / (1 - x * A(x)) ).at n=5A372179