68853

Appears in sequences

• Crystal ball sequence for D_7 lattice.at n=4A008360
• Numbers k such that sigma(reverse(k)) = sigma(reverse(k-1)) + sigma(reverse(k-2)).at n=23A069970
• a(n) = 2*a(n-1) - a(n-2) + (a(n-1)^2 + a(n-2)^2).at n=5A122591
• 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 486", based on the 5-celled von Neumann neighborhood.at n=16A282604
• a(0) = 0, and for n > 0, (a(n)) gives the indices n for which d(n) < d(k) for k < n, where d is the difference sequence of (cos k + sin k).at n=30A299640
• a(n) = Sum_{1 <= x_1 <= x_2 <= x_3 <= x_4 <= x_5 <= n} gcd(x_1, x_2, x_3 , x_4, x_5, n).at n=21A343519