A137111 Numbers k such that k and k^2 use only the digits 2, 5, 6, 7 and 8.

5, 25, 26, 75, 76, 85, 275, 525, 526, 725, 765, 766, 826, 875, 2585, 2785, 2875, 5275, 7525, 7665, 7666, 8525, 8675, 8765, 8865, 8875, 26875, 27525, 27725, 28675, 28785, 52525, 52785, 72576, 72585, 76526, 76585, 76665, 76666, 76725, 82875, 88785, 228665, 256266, 256275, 276725, 278725, 278865, 287725, 287865, 526525, 526865, 527525, 725725, 752785

Offset

1,1

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..844

J. Wellons, Tables of Shared Digits [archived]

Example

875686752587525^2 = 766827288657285222282785625625.

Mathematica

With[{c={2, 5, 6, 7, 8}}, Select[Flatten[Table[FromDigits/@Tuples[c, n], {n, 6}]], SubsetQ[ c, IntegerDigits[#^2]]&]] (* Harvey P. Dale, Mar 14 2023 *)

Crossrefs

Sequence in context: A037410 A070381 A136912 * A137110 A036137 A070380

Adjacent sequences: A137108 A137109 A137110 * A137112 A137113 A137114

Keyword

base,nonn

Author

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

Status

approved