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A168294 Carryless product n times n+1. 7
0, 2, 6, 2, 0, 0, 2, 6, 2, 90, 110, 132, 156, 172, 190, 110, 132, 156, 172, 280, 420, 462, 406, 442, 480, 420, 462, 406, 442, 670, 930, 992, 956, 912, 970, 930, 992, 956, 912, 260, 640, 622, 606, 682, 660, 640, 622, 606, 682, 50, 550, 552, 556, 552, 550, 550, 552, 556, 552 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..58.

David Applegate, Marc LeBrun and N. J. A. Sloane, Carryless Arithmetic (I): The Mod 10 Version.

Index entries for sequences related to carryless arithmetic

PROG

(Python)

def A168294(n):

    s, t = [int(d) for d in str(n)], [int(d) for d in str(n+1)]

    l, m = len(s), len(t)

    u = [0]*(l+m-1)

    for i in range(l):

        for j in range(m):

            u[i+j] = (u[i+j] + s[i]*t[j]) % 10

    return int("".join(str(d) for d in u)) # Chai Wah Wu, Jun 30 2020

CROSSREFS

Cf. A004520, A059729.

Sequence in context: A185972 A182918 A134301 * A004544 A010590 A049061

Adjacent sequences:  A168291 A168292 A168293 * A168295 A168296 A168297

KEYWORD

nonn,base

AUTHOR

David Applegate, Marc LeBrun and N. J. A. Sloane, Jul 06 2010

STATUS

approved

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Last modified February 27 11:38 EST 2021. Contains 341656 sequences. (Running on oeis4.)