265227
domain: N
Appears in sequences
- Numbers k such that sopf(k) = (1/2)*(sopf(k+1) + sopf(k-1)), where sopf(x) = sum of the distinct prime factors of x.at n=20A075846
- Array read by antidiagonals: T(m,n) = number of irredundant sets in the grid graph P_m X P_n.at n=39A286868
- Array read by antidiagonals: T(m,n) = number of irredundant sets in the grid graph P_m X P_n.at n=41A286868