33550335

Appears in sequences

• Number of 2n-bead balanced binary necklaces of fundamental period 2n, equivalent to reversed complement; also Dirichlet convolution of b_n=2^(n-1) with mu(n); also number of components of Mandelbrot set corresponding to Julia sets with an attractive n-cycle.at n=25A000740
• a(n) = (nextprime(4^n) - nextprime(2^n))/2.at n=13A037131
• Number of primitive (aperiodic) word structures of length n which contain exactly two different symbols.at n=25A056278
• Binary palindromic numbers with only one 0 bit.at n=12A129868
• Nearest-neighbors of perfect numbers.at n=8A135606
• Perfect numbers minus 1.at n=4A135627
• Decimal representation of the n-th iteration of the "Rule 203" elementary cellular automaton starting with a single ON (black) cell.at n=12A267685
• Decimal representation of the n-th iteration of the "Rule 217" elementary cellular automaton starting with a single ON (black) cell.at n=12A267812
• Main diagonal of A274637.at n=25A274638
• a(n) = (2^n - (-1+i)^n - (-1-i)^n)/4 - 1 where i is the imaginary unit.at n=26A275016
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 515", based on the 5-celled von Neumann neighborhood.at n=24A288827
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 515", based on the 5-celled von Neumann neighborhood.at n=24A288828
• a(n) = Sum_{d|n, gcd(d, n/d) = 1} (-1)^omega(n/d) * 2^(d-1).at n=25A343440
• a(n) = Sum_{k = ceiling(n/2)..n-1} A354169(k).at n=36A354757
• Numbers k such that A246601(k) > 2*k.at n=15A359084
• Odd numbers k such that A246601(k) > 2*k.at n=2A359085
• a(n) = A269795(n)/2.at n=27A365162