OFFSET
1,1
PROG
(PARI) ph1=1; ph2=1; for(n=3, 880254585, ph3=eulerphi(n); if(issquarefree(n)==0, if(ph3==ph1-ph2, print1(n ", "))); ph1=ph2; ph2=ph3) /* Donovan Johnson, Oct 20 2012 */
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Dec 20 2001
EXTENSIONS
a(10)-a(27) from Donovan Johnson, Oct 20 2012
STATUS
approved