OFFSET
1,7
COMMENTS
A sequence that contains itself as a proper subsequence (infinitely many times); that is, a fractal sequence.
LINKS
Clark Kimberling and John E. Brown, Partial Complements and Transposable Dispersions, J. Integer Seqs., Vol. 7, 2004.
EXAMPLE
Northwest corner of R:
1 2 4 6 9
3 5 8 11 15
7 10 14 18 23
12 16 21 26 32
19 24 30 36 43
a(10)=2 because 10 is in row 2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Sep 09 2003
STATUS
approved