OFFSET
1,3
COMMENTS
Square digits are 0, 1, 4 or 9. The non-single or nonisolated numbers are 0, 1, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 19, 20, 21,..
CROSSREFS
KEYWORD
nonn,base,less
AUTHOR
Juri-Stepan Gerasimov, Nov 17 2009
EXTENSIONS
Entries checked by R. J. Mathar, May 30 2010
STATUS
approved