A136934 Numbers k such that k and k^2 use only the digits 0, 3, 4, 7 and 9.

0, 3, 7, 30, 70, 97, 300, 700, 970, 997, 3000, 7000, 9700, 9970, 9997, 30000, 70000, 97000, 99700, 99970, 99997, 300000, 700000, 970000, 997000, 999700, 999970, 999997, 3000000, 3074003, 7000000, 9700000, 9970000, 9997000, 9999700, 9999970, 9999997, 30000000, 30740030, 70000000, 97000000, 99700000, 99970000, 99997000, 99999700, 99999970

Offset

1,2

Comments

Generated with DrScheme

Links

Jonathan Wellons, Table of n, a(n) for n = 1..209

J. Wellons, Tables of Shared Digits [archived]

Example

949070307079497^2 = 900734447779970733397477773009.

Crossrefs

Sequence in context: A057181 A333393 A227077 * A369083 A201794 A188229

Adjacent sequences: A136931 A136932 A136933 * A136935 A136936 A136937

Keyword

base,nonn

Author

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

Status

approved