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

Author

T. D. Noe, Apr 24 2011

Keywords

• nonn

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

Crossrefs

Cf. A003415, A099302, A189562.

Formula

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