OFFSET
1,2
EXAMPLE
a(4) is the 4th positive integer coprime to 4 and not among the first 3 terms of the sequence (i.e. the 4th term among 3, 9, 11, 13, 15,...).
CROSSREFS
KEYWORD
nonn
AUTHOR
Leroy Quet, Apr 04 2005
EXTENSIONS
More terms from John W. Layman, Apr 08 2005
STATUS
approved