1585273

Appears in sequences

• n is equal to the number of 4s in all numbers <= n written in base 7.at n=4A014888
• Decimal representation of the x-axis, from the left edge to the origin, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 457", based on the 5-celled von Neumann neighborhood.at n=20A282361