39300

Appears in sequences

• n(n+Z(n)), where Z( ) is the Narayana-Zidek-Capell sequence (A002083).at n=15A030625
• n^3*a(n) is the number of circles in complex projective plane tangent to three smooth curves of degree n in general position.at n=32A030653
• Number of idempotent 4X4 0..n matrices of rank 3.at n=15A224335
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 229", based on the 5-celled von Neumann neighborhood.at n=37A270948
• a(n) = 4*(n - 1)*(16*n - 23) for n >= 1.at n=25A304378
• Exponential (2,3)-perfect numbers: numbers m such that esigma(esigma(m)) = 3m, where esigma(m) is the sum of exponential divisors of m (A051377).at n=34A328132
• a(n) = Sum_{1 <= x_1 <= x_2 <= x_3 <= x_4 <= x_5 <= x_6 <= n} gcd(x_1, x_2, x_3 , x_4, x_5, x_6, n).at n=14A343520
• Irregular triangle read by rows: T(n,k) (0 <= k <= n^2) are coefficients of exact wrapping probability for site percolation on an n X n 2D nnsquare lattice with periodic boundary conditions. This is for the probability that it wraps around the vertical dimension.at n=41A366464