18844

Appears in sequences

• Initial members of abundant quintuplets, i.e., values of k such that (k, k+2, k+4, k+6, k+8) are all abundant numbers.at n=3A108926
• A156977/3.at n=29A164565
• Number of nX4 0..1 arrays with every row having the same least squares slope fit to a straight line, and every column the same least squares slope fit to a straight line, with a single point array taken as having zero slope.at n=8A223588
• Initial members of abundant quadruplets, i.e., values of k such that (k, k+2, k+4, k+6) are all abundant numbers.at n=32A231089
• Number of n X 5 0..2 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 3.at n=29A239358
• Compound filter (sum of proper divisors & prime signature): a(n) = P(A001065(n), A046523(n)), where P(n,k) is sequence A000027 used as a pairing function.at n=71A291765
• Expansion of Product_{k=1..10} theta_3(q^k), where theta_3() is the Jacobi theta function.at n=41A320242
• Triangle read by rows: T(n,k) is the number of acyclic digraphs on n unlabeled nodes with k arcs, n >=0, k = 0..(n-1)*n/2.at n=57A350447
• Number of integer partitions of n where the median is twice the minimum.at n=43A361861
• Array read by antidiagonals: A(n,k) is the number of sensed planar maps with n vertices and k faces including one distinguished outside face, n >= 1, k >= 1.at n=31A380240