OFFSET
1,4
COMMENTS
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..8192
FORMULA
a(n) = n - A061395(n).
For n > 1, a(2^n) = (2^n)-1.
MATHEMATICA
a[n_] := n - PrimePi[FactorInteger[n][[-1, 1]]]; Array[a, 100] (* Amiram Eldar, Mar 04 2024 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 04 2014
STATUS
approved