OFFSET
1,1
EXAMPLE
The prime 163 is the concatenation of nonprime numbers 1 and 63. 419 is the concatenation of 4, 1 and 9.
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Joseph L. Pe, Jan 16 2002
EXTENSIONS
More terms from Larry Reeves (larryr(AT)acm.org), Apr 03 2002
STATUS
approved