189264

Appears in sequences

• Numbers k such that abundance(k) = abundance(sigma(k)).at n=5A137210
• Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 3,0,2,1,1,0,0 for x=0,1,2,3,4,5,6.at n=6A197901
• Number of 4X4X4 triangular 0..n arrays with no element lying outside the (possibly reversed) range delimited by its sw and se neighbors, and every horizontal row having the same average value.at n=10A214542
• Number of permutations f of {1,...,n} with f(1) = 1 such that k*f(k) (k = 1..n) are distinct practical numbers.at n=22A389880