A137001 Numbers k such that k and k^2 use only the digits 1, 2, 4 and 9.

1, 2, 11, 12, 21, 212, 221911

Offset

1,2

Comments

Generated with DrScheme.

Links

Table of n, a(n) for n=1..7.

J. Wellons, Tables of Shared Digits [archived]

Example

221911^2 = 49244491921.

Crossrefs

Sequence in context: A136970 A136967 A213975 * A136996 A238109 A113720

Adjacent sequences: A136998 A136999 A137000 * A137002 A137003 A137004

Keyword

base,nonn,changed

Author

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

Status

approved