28379

Appears in sequences

• First run of n consecutive integers with same number of divisors ends at a(n).at n=5A019273
• a(n) = A007290(n+2) - 1 = 2*C(n+2,3) - 1.at n=43A108766
• Number of n X n binary matrices, symmetric about both diagonal and antidiagonal, with no more than 2 ones in any 2 X 2 subblock.at n=8A141505
• Numerators of certain rationals approximating sqrt(3).at n=4A224445
• Number of length n+1 0..6 arrays with the sum of the maximum of each adjacent pair multiplied by some arrangement of +-1 equal to zero.at n=4A250644
• T(n,k)=Number of length n+1 0..k arrays with the sum of the maximum of each adjacent pair multiplied by some arrangement of +-1 equal to zero.at n=49A250646
• Number of length 5+1 0..n arrays with the sum of the maximum of each adjacent pair multiplied by some arrangement of +-1 equal to zero.at n=5A250649
• Triangle T(n,k) in which the n-th row encodes the inverse of a 3n X 3n Jacobi matrix, with 1's on the lower, main, and upper diagonals in GF(2), where the encoding consists of the decimal representations for the binary rows (n >= 1, 1 <= k <= 3n).at n=34A363146
• Triangle read by rows: the n-th row gives the least sequence of n consecutive numbers with the same number of divisors.at n=20A376557