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.
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!)
A053881 Squares composed of digits {1,2,4}. 3
1, 4, 121, 144, 441, 1444, 114244, 2214144, 11142244, 121242121, 421111441, 1111422244, 44424414441, 111114222244, 11111142222244, 214222214414224, 242441124211441, 411244411422244, 1111111422222244, 2111211444222241 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Zhao Hui Du, Table of n, a(n) for n = 1..54
Patrick De Geest, Squares containing at most three distinct digits, Index entries for related sequences
FORMULA
a(n) = A053880(n)^2.
CROSSREFS
Cf. A053880.
Sequence in context: A286757 A239187 A062081 * A075114 A017186 A355751
Adjacent sequences: A053878 A053879 A053880 * A053882 A053883 A053884
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Mar 15 2000
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 May 14 12:38 EDT 2024. Contains 372533 sequences. (Running on oeis4.)