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A137013
Numbers k such that k and k^2 use only the digits 1, 2, 6 and 7.
0
1, 11, 26, 276, 161761
OFFSET
1,2
COMMENTS
Generated with DrScheme.
LINKS
EXAMPLE
161761^2 = 26166621121.
CROSSREFS
Sequence in context: A027521 A238147 A137014 * A014468 A156373 A368930
KEYWORD
base,nonn,more
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved