OFFSET
1,1
LINKS
Cino Hilliard, Proof of the Digital Root Theorem, posted on Yahoo group B2LCC, Feb 17 2003
PROG
(PARI) drp(n) = { forprime(x=2, n, r = x%9; if(isprime(r), print1(r" "); ); ); }
CROSSREFS
KEYWORD
easy,nonn,base
AUTHOR
Cino Hilliard, Dec 24 2002
EXTENSIONS
More terms from Joshua Zucker, Jul 24 2006
STATUS
approved