A136983 Numbers k such that k and k^2 use only the digits 1, 2, 3, 7 and 9.

1, 3, 11, 27, 111, 139, 173, 177, 373, 1139, 1339, 1927, 2777, 3373, 11123, 13123, 17123, 17923, 17927, 19777, 27927, 117123, 133123, 173139, 193373, 199277, 279177, 312911, 373139, 1127927, 1131339, 1312239, 1392739, 1712373, 1771777, 1771923, 1792739, 1799277, 1933177, 1977911, 1977923, 1993223, 1997927, 2792739, 3731927, 11122939

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..313

J. Wellons, Tables of Shared Digits [archived]

Example

373193291731927^2 = 139273232993711173339231133329.

Crossrefs

Sequence in context: A113836 A036571 A003060 * A210611 A119074 A211810

Adjacent sequences: A136980 A136981 A136982 * A136984 A136985 A136986

Keyword

base,nonn,changed

Author

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

Status

approved