A137143 Numbers k such that k and k^2 use only the digits 4, 5, 7, 8 and 9.

7, 88, 888, 7588, 9878, 75888, 885888, 989878, 7479878, 7589457, 7745957, 9775457, 97748957, 744888978, 757944588, 945985457, 7475598878, 9948757588, 88757455957, 99977995478, 747595978788, 947878988978, 948445875888, 994477479878, 997494589457, 7588797959878, 8875584485457, 9475747457588, 9478895478788, 9745484895478

Offset

1,1

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..66

J. Wellons, Tables of Shared Digits [archived]

Example

947574745798978^2 = 897897898875997774859585844484.

Crossrefs

Sequence in context: A372732 A155465 A296735 * A069430 A020564 A006291

Adjacent sequences: A137140 A137141 A137142 * A137144 A137145 A137146

Keyword

base,nonn

Author

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

Status

approved