OFFSET
1,4
COMMENTS
a(n) = n-1 for n in A209211.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..65537
FORMULA
MATHEMATICA
Array[# - GCD[# - 1, EulerPhi[#]] &, 100] (* Alonso del Arte, Sep 09 2018 *)
PROG
(PARI) A318827(n) = (n-gcd(eulerphi(n), n-1));
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Sep 09 2018
STATUS
approved