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A137057
Numbers k such that k and k^2 use only the digits 1, 4, 7 and 8.
0
1, 88, 4141, 8878
OFFSET
1,2
COMMENTS
Generated with DrScheme.
LINKS
EXAMPLE
4141^2 = 17147881.
CROSSREFS
Sequence in context: A035739 A035807 A017751 * A197321 A004391 A281985
KEYWORD
base,nonn,more
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved