OFFSET
1,1
LINKS
Giovanni Resta, Table of n, a(n) for n = 1..425
PROG
(PARI) for(n=2, 10^9, if(Mod(7, n^2)^(eulerphi(n))==1, print1(n, ", ")))
CROSSREFS
KEYWORD
nonn
AUTHOR
Felix Fröhlich, May 27 2014
EXTENSIONS
Terms a(23) and beyond from Giovanni Resta, Jan 24 2020
STATUS
approved