A136903 Numbers k such that k and k^2 use only the digits 0, 2, 4, 6 and 7.

0, 2, 20, 26, 200, 260, 474, 2000, 2600, 2602, 4740, 4762, 20000, 20602, 26000, 26020, 26602, 47400, 47620, 77474, 77602, 200000, 206020, 260000, 260200, 266020, 474000, 476200, 476474, 476662, 774740, 776020, 2000000, 2006002, 2060200, 2060762, 2600000, 2602000, 2647026, 2660200, 4474674, 4740000, 4762000, 4764740, 4766620, 7747400

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..661

J. Wellons, Tables of Shared Digits [archived]

Example

776020464064074^2 = 602207760646220766424777477476.

Mathematica

Module[{d={0, 2, 4, 6, 7}}, Select[FromDigits/@Tuples[d, 7], SubsetQ[d, IntegerDigits[ #^2]]&]] (* Harvey P. Dale, Nov 27 2022 *)

Crossrefs

Sequence in context: A108061 A154546 A108342 * A078460 A059208 A268742

Adjacent sequences: A136900 A136901 A136902 * A136904 A136905 A136906

Keyword

base,nonn

Author

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

Status

approved