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A137139
Numbers k such that k and k^2 use only the digits 4, 5, 6 and 7.
1
74, 76, 74476, 74474476
OFFSET
1,1
COMMENTS
Generated with DrScheme.
LINKS
EXAMPLE
74474476^2 = 5546447575474576.
CROSSREFS
Sequence in context: A104421 A352382 A136948 * A095569 A305265 A055111
KEYWORD
base,nonn,more
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved