501008

Appears in sequences

• Numbers k such that sigma(k-2) + sigma(k+2) = sigma(2k).at n=24A067172
• Number of -3..3 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 four, six or seven distinct values for every i,j,k<=n.at n=9A211737
• Number of (n+2) X (1+2) 0..1 arrays with every 2 X 2 and 3 X 3 subblock diagonal maximum minus antidiagonal minimum unequal to its neighbors horizontally and vertically.at n=13A253360