42217

Appears in sequences

• Number of atoms in a decahedron with n shells.at n=37A004068
• Numbers k such that the sum of the divisors of 2*k^2 is a square.at n=10A097023
• Number of -1..1 arrays x(i) of n+1 elements i=1..n+1 with set{t,u,v in 0,1}((x[i+t]+x[j+u]+x[k+v])*(-1)^(t+u+v)) having one, two, three, four, five or six distinct values for every i,j,k<=n.at n=9A211531
• Number of (w,x,y,z) with all terms in {1,...,n} and |w-x|=|x-y|+|y-z|.at n=37A212570
• Numbers n such that the average of the positive divisors of n^2 is a square.at n=3A272442