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!)
A169821 a(n) = n*n in carryless arithmetic mod 9 in base 10. 2
0, 1, 4, 0, 7, 7, 0, 4, 1, 0, 100, 121, 144, 160, 187, 117, 130, 154, 171, 100, 400, 441, 484, 430, 477, 427, 460, 414, 451, 400, 0, 61, 34, 0, 67, 37, 0, 64, 31, 0, 700, 781, 774, 760, 757, 747, 730, 724, 711, 700, 700, 711, 724, 730, 747, 757, 760, 774, 781, 700, 0, 31, 64 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
Addition and multiplication are the same as in school, that is, done in base 10, except that there are no carries and individual digits are added or multiplied mod 9.
LINKS
EXAMPLE
13*13 = 160:
..13
..13
----
..30
.13.
----
.160
----
CROSSREFS
Cf. A010878, A169908. See A170990 for a better version.
Sequence in context: A117543 A242970 A070433 * A170990 A013666 A196533
KEYWORD
nonn,base
AUTHOR
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 April 14 14:16 EDT 2024. Contains 371665 sequences. (Running on oeis4.)