OFFSET
1,1
COMMENTS
The condition 'at least two terms' is imposed to avoid the trivial grouping (1),(2),(3),(4),(5),... a(n) == 0 (mod n) by definition.
CROSSREFS
KEYWORD
nonn
AUTHOR
Amarnath Murthy, Sep 24 2003
EXTENSIONS
More terms from Ray Chandler, Sep 26 2003
STATUS
approved