19210577

Appears in sequences

• a(n) is the position of a(n-1) in the decimal expansion of Pi, starting with a(1)=13.at n=20A119744
• 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 419", based on the 5-celled von Neumann neighborhood.at n=25A282071