4,1

Fourth column of triangle in A081532. - N. J. A. Sloane, Oct 12 2010.

Table of n, a(n) for n=4..108.

a(5) = 8 because divisors of 16 are 1,2,4,8,16

Cf. A081532, A171783. - N. J. A. Sloane, Oct 12 2010.

Sequence in context: A195492 A269802 A269991 * A200133 A021150 A065166

Adjacent sequences: A171781 A171782 A171783 * A171785 A171786 A171787

nonn

J. Lowell, Oct 12 2010

More terms from R. J. Mathar, Oct 13 2010

approved