login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A137044 Numbers k such that k and k^2 use only the digits 1, 3, 8 and 9. 0
1, 3, 9, 1998333891 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Generated with DrScheme.
LINKS
EXAMPLE
1998333891^2 = 3993338339919199881.
MATHEMATICA
With[{c={1, 3, 8, 9}}, Select[Flatten[Table[FromDigits/@Tuples[c, n], {n, 10}]], SubsetQ[c, IntegerDigits[#^2]]&]] (* Harvey P. Dale, Dec 04 2018 *)
CROSSREFS
Sequence in context: A116620 A057269 A113116 * A188545 A336747 A212361
KEYWORD
base,nonn
AUTHOR
Jonathan Wellons (wellons(AT)gmail.com), Jan 22 2008
STATUS
approved

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)