The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A136909 Numbers k such that k and k^2 use only the digits 0, 2, 4, 8 and 9. 1

%I #9 Apr 12 2024 09:51:26

%S 0,2,20,22,200,202,220,222,288,298,498,2000,2002,2020,2022,2200,2202,

%T 2220,2880,2980,2998,4980,4998,20000,20002,20020,20022,20200,20220,

%U 20222,22000,22002,22020,22200,22202,28800,28998,29800,29980,29998,44998,48998,49800,49980,49998,89498,200000,200002,200020,200022,200200,200202,200220,200222

%N Numbers k such that k and k^2 use only the digits 0, 2, 4, 8 and 9.

%C Generated with DrScheme.

%H Jonathan Wellons, <a href="/A136909/b136909.txt">Table of n, a(n) for n = 1..1093</a>

%H J. Wellons, <a href="https://web.archive.org/web/20090206165028/http://jonathanwellons.com/shared-digits/">Tables of Shared Digits</a> [archived]

%e 92098040202^2 = 8482049009049208200804.

%t Module[{c={0,2,4,8,9},t},t=FromDigits/@Tuples[c,6];Select[t,SubsetQ[c, IntegerDigits[#^2]]&]] (* _Harvey P. Dale_, Nov 26 2014 *)

%K base,nonn

%O 1,2

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 16 16:46 EDT 2024. Contains 373432 sequences. (Running on oeis4.)