OFFSET
1,1
COMMENTS
Conjecture: limit of a(n)/n is zero.
This conjecture is certainly wrong as stated, because sequences "Numbers such that..." have lim a(n)/n >= 1 and a(n) > n for all indices following the first one for which this holds, as here: a(1) > 1. - M. F. Hasler, Feb 24 2014
LINKS
Robert G. Wilson v, Table of n, a(n) for n = 1..220
FORMULA
PROG
(PARI) isok(m) = sum(x=1, m, Mod(x, m)^m==1) != gcd(m, eulerphi(m)); \\ Michel Marcus, Feb 18 2021
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Aug 21 2002
STATUS
approved