OFFSET
1,2
EXAMPLE
For a(8), having already 1, 2, 3, 4, 5, 6, 7, the next number must be 12 because after 1,2,3,4,5,6,7 we shall continue with a 1.
But 1 is already in the sequence so we need to add a 2 -> 12. And so on.
CROSSREFS
KEYWORD
easy,base,nonn
AUTHOR
Paolo P. Lava and Giorgio Balzarotti, Sep 14 2009
EXTENSIONS
Keyword base added by R. J. Mathar, Feb 02 2010
STATUS
approved