A136926 Numbers k such that k and k^2 use only the digits 0, 2, 7 and 9.

0, 27, 270, 2700, 27000, 270000, 2700000, 27000000, 270000000, 2700000000, 27000000000, 270000000000, 2700000000000, 27000000000000, 270000000000000, 2700000000000000, 27000000000000000, 270000000000000000, 2700000000000000000, 27000000000000000000

Offset

1,2

Comments

Generated with DrScheme.

Links

Table of n, a(n) for n=1..20.

Jonathan Wellons, Tables of Shared Digits [archived]

Example

270000000000000^2 = 72900000000000000000000000000.

Crossrefs

Sequence in context: A108670 A136925 A181323 * A042412 A078876 A059603

Adjacent sequences: A136923 A136924 A136925 * A136927 A136928 A136929

Keyword

base,nonn

Author

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

Extensions

a(16)-a(20) from Pontus von Brömssen, May 01 2024

Status

approved