OFFSET
2,1
COMMENTS
Are these concatenations squarefree?
FORMULA
EXAMPLE
a(4) = 587 is the greatest prime factor of 1761 =3*587.
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Nov 23 2004
EXTENSIONS
More terms from R. J. Mathar, Aug 07 2007
STATUS
approved