A137029 Numbers k such that k and k^2 use only the digits 1, 3, 4, 7 and 9.

1, 3, 7, 19479, 134143, 379143, 439479, 971479, 1199143, 37917979, 97339479, 199434143, 314917979, 413934143, 443979479, 974379143, 1191399143, 1979379143, 3799934143, 4439979479, 13943149479, 34317917979, 199949471479, 3119999114479, 3791347379143, 4139944979479, 4379419449479, 4447177949143, 9997174339479

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..35

J. Wellons, Tables of Shared Digits [archived]

Example

141399141934143^2 = 19993717339711917414949144449.

Crossrefs

Sequence in context: A101006 A306632 A083461 * A174307 A351848 A137125

Adjacent sequences: A137026 A137027 A137028 * A137030 A137031 A137032

Keyword

base,nonn,changed

Author

Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008

Status

approved