27090

Appears in sequences

• Numerators of continued fraction convergents to sqrt(904).at n=2A042746
• Triangle read by rows: T(n,k) = k!*binomial(n-1,k-1)*Stirling2(n,k), 1 <= k <= n.at n=23A048743
• Number of ways to place 3 nonattacking queens on a 3 X n board.at n=33A061989
• Numbers k such that sigma(k)+1 is a square and sets a new record for such squares.at n=39A063729
• Solution to the Dancing School Problem with 3 girls and n+3 boys: f(3,n).at n=30A079908
• Coefficients of polynomial P(n) by rows, with P(n) = (x+1)^n + 2^(n-3)*((x+1)^n - x^n - 1) for n > 0 and P(0) = 1.at n=59A146769
• Averages of two consecutive odd cubes; a(n) = (n^3 + (n+2)^3)/2.at n=14A173962
• Floor((n+1/n)^3).at n=29A197602
• a(n) = round((n+1/n)^3).at n=29A197986
• Size of the edge set of the Generalized Lucas Cube Q_n(111).at n=14A219355
• The second rank moment function N_2(n).at n=20A220908
• Denominators of rationals with e.g.f. D(3,x), a Debye function.at n=42A227571
• Numbers n such that the sum of the distinct prime factors of prime(n)-1 and prime(n+1)-1 are the same.at n=17A259562
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 182", based on the 5-celled von Neumann neighborhood.at n=40A270632
• Numbers k such that 1/phi(x) + 1/phi(y) = 1/phi(k), for some x + y = k and phi(k) is the Euler totient function of k.at n=33A279621
• Expansion of the series reversion of x*Product_{k>=0} (1 + x^(2^k) + x^(2^(k + 1))).at n=11A292363
• Number of vertices in an equilateral triangle "frame" of size n (see Comments in A328526 for definition).at n=15A333031
• Table read by ascending antidiagonals: T(n, k) is the maximum number of quasi k-gons that are not k-gons in a finite projective plane of order n, with k >= 3.at n=10A342307
• Indices of metallic means that are powers of other metallic means.at n=43A352403
• a(n) is the smallest number that has exactly n evil divisors (A001969).at n=38A356019