3663871

Appears in sequences

• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 379", based on the 5-celled von Neumann neighborhood.at n=21A281635
• Numbers k such that sigma(k) - k - 1 is a perfect number.at n=34A293992