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A189561
Number of even numbers k that have n solutions to the equation x' = k, where x' denotes the arithmetic derivative (A003415).
3
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.
FORMULA
a(n) is the number of k such that A099302(k) = n.
CROSSREFS
KEYWORD
nonn
AUTHOR
T. D. Noe, Apr 24 2011
STATUS
approved