OFFSET
0,2
EXAMPLE
a(18) = 27282 because 27282 is squarefree, while 27, 272 and 2728 are not and 2 has already been used.
a(19) = 930 because 9 is not squarefree and 93 would cause a(20) to have a leading 0.
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Jul 14 2003
EXTENSIONS
More terms from David Wasserman, Feb 14 2005
STATUS
approved