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!)
A137056 Numbers k such that k and k^2 use only the digits 1, 4, 6 and 9. 0
1, 4, 14, 119, 4119 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Generated with DrScheme.

LINKS

Table of n, a(n) for n=1..5.

J. Wellons, Tables of Shared Digits

EXAMPLE

4119^2 = 16966161.

PROG

(PARI) isokd(d) = #setintersect([0, 2, 3, 5, 7, 8], Set(d)) == 0;

isok(k) = isokd(digits(k)) && isokd(digits(k^2)); \\ Michel Marcus, Jun 24 2021

CROSSREFS

Sequence in context: A065062 A240273 A137048 * A302021 A006824 A333730

Adjacent sequences:  A137053 A137054 A137055 * A137057 A137058 A137059

KEYWORD

base,nonn,more

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 September 27 13:46 EDT 2022. Contains 357062 sequences. (Running on oeis4.)