A189561 Number of even numbers k that have n solutions to the equation x' = k, where x' denotes the arithmetic derivative (A003415).

1, 3, 7, 9, 13, 13, 16, 18, 19, 24, 17, 26, 17, 23, 25, 23, 28, 25, 23, 37, 21, 28, 25, 22, 36, 30, 34, 38, 28, 28, 27, 28, 45, 37, 35, 36, 34, 35, 33, 33, 31, 35, 35, 31, 43, 33, 37, 44, 36, 37, 38, 30, 50, 36, 44, 47, 43, 33, 43, 50, 36, 39, 38, 31, 41, 48

Offset

0,2

Comments

A189562 lists the even numbers for each n.

References

See A003415.

Links

T. D. Noe, Table of n, a(n) for n = 0..250

Formula

a(n) is the number of k such that A099302(k) = n.

Crossrefs

Cf. A003415, A099302, A189562.

Sequence in context: A190752 A353103 A087064 * A087550 A235387 A285144

Adjacent sequences: A189558 A189559 A189560 * A189562 A189563 A189564

Keyword

nonn

Author

T. D. Noe, Apr 24 2011

Status

approved