67198

Appears in sequences

• Numbers n such that sigma(n+1)-sigma(n) = -sigma(n)/d(n), where d(n) denotes the number of divisors of n.at n=13A066177
• a(n) = n^3 - n^2 - n - 1.at n=41A083074
• a(n) = sigma_3(n) - sigma_2(n) - sigma_1(n).at n=40A092350
• T(n,k) is the number of (n*k) X k binary arrays with nonzero rows in decreasing order and n ones in every column.at n=31A188445
• Number of (4*n) X n binary arrays with nonzero rows in decreasing order and 4 ones in every column.at n=5A188446
• Number of n-regular hypergraphs on 5 labeled vertices.at n=4A331127
• Number of n-regular hypergraphs on 5 labeled vertices.at n=12A331127