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A091257 Multiplication table A x B computed for polynomials over GF(2), where (A,B) runs as (1,1),(1,2),(2,1),(1,3),(2,2),(3,1),... 4
1, 2, 2, 3, 4, 3, 4, 6, 6, 4, 5, 8, 5, 8, 5, 6, 10, 12, 12, 10, 6, 7, 12, 15, 16, 15, 12, 7, 8, 14, 10, 20, 20, 10, 14, 8, 9, 16, 9, 24, 17, 24, 9, 16, 9, 10, 18, 24, 28, 30, 30, 28, 24, 18, 10, 11, 20, 27, 32, 27, 20, 27, 32, 27, 20, 11, 12, 22, 30, 36, 40, 18, 18, 40, 36, 30 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Essentially same as A048720 but computed starting from offset one instead of zero. Analogous to A003991. Each n occurs A091220(n) times.

LINKS

Table of n, a(n) for n=1..76.

A. Karttunen, Scheme-program for computing this sequence.

Index entries for sequences operating on GF(2)[X]-polynomials

CROSSREFS

a(n) = A048720bi(A091255(n), A091256(n)) because the identity A x B = gcd(A, B) x lcm(A, B) holds also in the polynomial ring GF(2)[X].

Sequence in context: A032355 A205153 A300302 * A216622 A319840 A003991

Adjacent sequences:  A091254 A091255 A091256 * A091258 A091259 A091260

KEYWORD

nonn,tabl

AUTHOR

Antti Karttunen, Jan 03 2004

STATUS

approved

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Last modified November 21 07:33 EST 2018. Contains 317428 sequences. (Running on oeis4.)