A170990 Carryless product n X n in base 9.

0, 1, 4, 0, 7, 7, 0, 4, 1, 81, 100, 121, 135, 160, 97, 108, 130, 145, 324, 361, 400, 351, 394, 349, 378, 337, 370, 0, 55, 31, 0, 61, 34, 0, 58, 28, 567, 640, 634, 621, 619, 610, 594, 589, 577, 567, 577, 589, 594, 610, 619, 621, 634, 640, 0, 28, 58, 0, 34, 61, 0, 31, 55, 324, 370

Offset: 0

Author

N. J. A. Sloane, Aug 29 2010

Keywords

• nonn
• base
• look

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..6560
• David Applegate, Marc LeBrun and N. J. A. Sloane, Carryless Arithmetic (I): The Mod 10 Version.
• Index entries for sequences related to carryless arithmetic

Crossrefs

For bases 2 through 10 see A000695, A169999, A170985-A170990 and A059729. A169821 is a less satisfactory variant.

Programs

PARI

a(n) = fromdigits(Vec(Pol(digits(n, 9))^2)%9, 9); \\ Seiichi Manyama, Mar 09 2023