OFFSET
1,2
EXAMPLE
449 = 20^2 + 7^2 has 192 primitive roots, of which 41 are prime, of which 20 are in A002313.
CROSSREFS
KEYWORD
nonn,fini,full,easy
AUTHOR
Sven Simon, May 17 2003
EXTENSIONS
Offset changed to 1 by Jinyuan Wang, Mar 09 2020
Name edited by Michel Marcus, Mar 09 2020
STATUS
approved