OFFSET
1,1
COMMENTS
LINKS
Graeme McRae, Table of n, a(n) for n = 1..27348
EXAMPLE
a(1)=12 because 12 is the first Early Bird.
a(2)=21 because 21 is the second Early Bird.
a(3)=23 because 23 is the third Early Bird.
a(4)=31 because 31 is the fourth Early Bird.
a(5)=34 because 31-32 are Early Birds and 33 is not an Early Bird.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Graeme McRae, Aug 11 2007
STATUS
approved