login
A264810
Number of numbers k <= n such that phi(m) = k for some m.
3
1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 12, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 26, 26, 26, 27, 27, 28, 28, 28, 28
OFFSET
1,2
COMMENTS
Partial sums of A264739;
a(n) = n - A180639(n).
LINKS
PROG
(Haskell)
a264810 n = a264810_list !! (n-1)
a264810_list = scanl1 (+) a264739_list
(PARI) first(n)=my(s); vector(n, k, s+=istotient(k)) \\ Charles R Greathouse IV, Sep 02 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Nov 26 2015
STATUS
approved