OFFSET
1,2
COMMENTS
1. Sequence is infinite.
2. First absent numbers are:
5, 6, 9, 10, 15, 16, 17, 18, 19, 20, 27, 28, 29, 30, 40, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 70, 80, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 100.
CROSSREFS
KEYWORD
nonn
AUTHOR
Zak Seidov, Apr 05 2009
STATUS
approved