OFFSET
1,1
COMMENTS
Products of pairs of elements of A169911 in carryless digital root arithmetic in base 10.
EXAMPLE
a(1) = 9 because the smallest prime in carryless digital root arithmetic in base 10 is 3, and 3*3 = 9.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Jonathan Vos Post, Jul 17 2010
EXTENSIONS
Edited and corrected by N. J. A. Sloane, Jul 17 2010
STATUS
approved