28063

Appears in sequences

• Differences between two positive cubes in exactly 2 ways.at n=18A014440
• Expansion of 1/((1-4x)(1-6x)(1-9x)).at n=4A019443
• Pseudoprimes to base 15.at n=33A020143
• Difference between two positive cubes in more than one way.at n=20A034179
• Increasing gaps in A038593 (lower terms).at n=15A093342
• Triangle read by rows: row n is the first row of the matrix M[n]^(n-1), where M[n] is the n X n tridiagonal matrix with main diagonal (3,4,4,...) and super- and subdiagonals (1,1,1,...).at n=29A124574
• Number of (n+3) X 7 binary arrays with every 4 X 4 subblock commuting with each horizontal and vertical neighbor 4 X 4 subblock.at n=14A188100
• Hyper-Wiener index of a benzenoid consisting of a chain of n hexagons characterized by the encoding s = 1133 (see the Gutman et al. reference, Sec. 5).at n=9A193400
• Positive numbers that are the sum of two (possibly negative) cubes in at least 2 ways (primitive solutions).at n=39A293647
• Sum of two (possibly negative) coprime cubes in at least 2 ways, but not the sum of 2 noncoprime cubes.at n=22A293648
• Number of compositions of n such that the difference between adjacent parts is at least two.at n=25A332829
• Irregular triangle read by rows: T(n,k) for k <= n/2 is the number of partitions of the repunit A002275(n) into k nonzero complementary binary vectors having a common divisor > 1 in base 10.at n=33A378761
• Triangle T(n,k), n >= 0, 0 <= k <= n, read by rows, where T(n,k) = 2^(n-k) * T(n-1,k-1) + 3^k * T(n-1,k) with T(n,k) = n^k if n*k=0.at n=23A383753
• Triangle T(n,k), n >= 0, 0 <= k <= n, read by rows, where T(n,k) = 2^(n-k) * T(n-1,k-1) + 3^k * T(n-1,k) with T(n,k) = n^k if n*k=0.at n=25A383753