A137028 Numbers k such that k and k^2 use only the digits 1, 3, 4, 7 and 8.

1, 38, 88, 1188, 4141, 8878, 11478, 18471, 33878, 183878, 844878, 887771, 1347141, 3381378, 33883878, 43344878, 88811471, 177317438, 178374141, 333374141, 338841141, 344743878, 844877141, 887377438, 3334348188, 3441183188, 8817473471, 11483831378, 13347183878, 13371137378, 13484747378, 17713783188, 17744811471

Offset

1,2

Comments

Generated with DrScheme.

Links

Jonathan Wellons, Table of n, a(n) for n = 1..112

J. Wellons, Tables of Shared Digits [archived]

Example

344787487347378^2 = 118878411431318344438843474884.

Mathematica

Module[{c={1, 3, 4, 7, 8}}, Table[Select[FromDigits/@Tuples[c, n], SubsetQ[c, IntegerDigits[#^2]]&], {n, 11}]]//Flatten (* Harvey P. Dale, Feb 22 2024 *)

Crossrefs

Sequence in context: A044557 A014716 A374268 * A235087 A235080 A218331

Adjacent sequences: A137025 A137026 A137027 * A137029 A137030 A137031

Keyword

base,nonn

Author

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

Status

approved