OFFSET
1,6
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..65537
FORMULA
a(n) = gcd(n, A009223(n)). - Antti Karttunen, Sep 07 2018
MATHEMATICA
Table[Apply[GCD, {w, DivisorSigma[1, w], EulerPhi[w]}], {w, 1, 128}]
PROG
(PARI) A074389(n) = gcd([n, sigma(n), eulerphi(n)]); \\ Antti Karttunen, Sep 07 2018
CROSSREFS
In the old definition the erroneously given formula gcd(n, A000005(n), A000010(n)) is now sequence A318459. - Antti Karttunen, Sep 07 2018
KEYWORD
nonn
AUTHOR
Labos Elemer, Aug 23 2002
EXTENSIONS
Name corrected by Antti Karttunen, Sep 07 2018
STATUS
approved