56896

Appears in sequences

• Numbers k that divide tau(k)*sigma(k).at n=41A071707
• Numbers k such that the harmonic mean of the divisors of k is the square of a rational number.at n=15A074266
• Numbers k such that sigma(k) divides k^2.at n=29A090777
• Triangle read by rows: T(n,k) (0<=k<=n) is the number of Schroeder paths of length 2n, having k (1,0)-steps on the lines y=0 and y=1 (a Schroeder path of length 2n is a path from (0,0) to (2n,0), consisting of steps U=(1,1), D=(1,-1) and H=(2,0) and never going below the x-axis).at n=46A110189
• Weight distribution of [120,60,20] binary extended quadratic-residue (or QR) code.at n=5A145685
• Numbers k for which sigma(k)/k - 2/7 is an integer.at n=2A218409
• Numbers n such that tau(n)*sigma(n) divides n^2.at n=2A245787
• Growth series for affine Coxeter group (or affine Weyl group) D_7.at n=13A266762
• 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 545", based on the 5-celled von Neumann neighborhood.at n=17A283012
• 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 801", based on the 5-celled von Neumann neighborhood.at n=17A284136
• Positive solution to 2^(n-1) = (1/n) * Sum_{d|n} a(d) * a(n/d).at n=13A299119
• Numbers k such that k divides lcm(tau(k), sigma(k)).at n=20A307740
• Composite numbers whose harmonic mean of their divisors that are larger than 1 is an integer.at n=30A335267
• Numbers k for which sigma(k)/k = 16/7.at n=2A347169