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A137141
Numbers k such that k and k^2 use only the digits 4, 5, 6, 7 and 9.
1
7, 74, 76, 676, 67657, 74476, 97764, 746657, 759576, 774576, 974474, 6674576, 7469657, 7549474, 7745676, 9974766, 67597764, 67797976, 74474476, 74495476, 74669657, 74697764, 74799576, 75475676, 77457574, 97967574, 99777976, 666745676, 675647576, 744759657, 754947976, 977469676, 6676576666, 7449697764, 7459595476, 7469574657
OFFSET
1,1
COMMENTS
Generated with DrScheme.
LINKS
J. Wellons, Tables of Shared Digits [archived]
EXAMPLE
997494594794657^2 = 994995466644556959799995747649.
CROSSREFS
Sequence in context: A367179 A106427 A106417 * A275618 A377097 A114472
KEYWORD
base,nonn
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved