A136990 - OEIS

A136990

Numbers k such that k and k^2 use only the digits 1, 2, 4, 5 and 8.

1, 2, 5, 11, 12, 15, 21, 22, 112, 122, 211, 221, 285, 1122, 1488, 1585, 2211, 2285, 11141, 12421, 12428, 15888, 111585, 124585, 145415, 241285, 242511, 285112, 285515, 285521, 285522, 1114112, 1114815, 1188522, 1248285, 1455512, 1558285, 1585185, 2284488, 2414218, 2425185, 2854515, 11145511, 11148285, 11155485, 12184112, 12188282

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Generated with DrScheme.

LINKS

Jonathan Wellons, Table of n, a(n) for n = 1..310

J. Wellons, Tables of Shared Digits [archived]

EXAMPLE

212418285828415^2 = 45121528154282212822821412225.

MATHEMATICA

With[{c={1, 2, 4, 5, 8}}, Select[Flatten[Table[FromDigits/@Tuples[c, n], {n, 8}]], SubsetQ[c, IntegerDigits[#^2 ]]&]] (* Harvey P. Dale, Jun 12 2017 *)

CROSSREFS

Sequence in context: A371433 A093554 A168453 * A136968 A136991 A136989

Adjacent sequences: A136987 A136988 A136989 * A136991 A136992 A136993

KEYWORD

base,nonn

AUTHOR

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

STATUS

approved