A136925 Numbers k such that k and k^2 use only the digits 0, 2, 7, 8 and 9.

0, 27, 270, 297, 2700, 2970, 2997, 27000, 28297, 29700, 29970, 29997, 88277, 270000, 282970, 297000, 298027, 299700, 299970, 299997, 882770, 2700000, 2787997, 2829700, 2970000, 2980270, 2997000, 2999700, 2999970, 2999997, 8827700, 9888277, 27000000, 27879970, 27980297, 28297000, 28299827, 29700000, 29802700, 29970000, 29997000

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..406

J. Wellons, Tables of Shared Digits [archived]

Example

879077927702027^2 = 772778002972890209208899908729.

Mathematica

With[{c={0, 2, 7, 8, 9}}, Select[FromDigits/@Tuples[c, 8], SubsetQ[c, IntegerDigits[#^2]]&]] (* Harvey P. Dale, Apr 27 2015 *)

Crossrefs

Sequence in context: A125390 A126548 A108670 * A181323 A136926 A042412

Adjacent sequences: A136922 A136923 A136924 * A136926 A136927 A136928

Keyword

base,nonn,changed

Author

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

Status

approved