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A363930 Irregular table T(n, k), n >= 0, k = 1..A363710(n), read by rows; the n-th row lists the nonnegative numbers m <= n such that A003188(m) AND A003188(n-m) = 0 (where AND denotes the bitwise AND operator). 1

%I #9 Jun 30 2023 01:01:40

%S 0,0,1,0,2,0,3,0,1,3,4,0,1,4,5,0,6,0,7,0,1,7,8,0,1,2,3,6,7,8,9,0,2,3,

%T 7,8,10,0,3,8,11,0,1,3,9,11,12,0,1,12,13,0,14,0,15,0,1,15,16,0,1,2,3,

%U 14,15,16,17,0,2,3,4,6,12,14,15,16,18,0,3,4,7,12,15,16,19

%N Irregular table T(n, k), n >= 0, k = 1..A363710(n), read by rows; the n-th row lists the nonnegative numbers m <= n such that A003188(m) AND A003188(n-m) = 0 (where AND denotes the bitwise AND operator).

%C This sequence is related to the T-square fractal (see A363710).

%H Rémy Sigrist, <a href="/A363930/b363930.txt">Table of n, a(n) for n = 0..13126</a> (rows for n = 0..2^9 flattened)

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/T-square_(fractal)">T-square (fractal)</a>

%F T(n, 1) = 0.

%F T(n, A363710(n)) = n.

%F T(n, k) + T(n, A363710(n)+1-k) = n.

%e Table T(n, k) begins:

%e n n-th row

%e -- ----------------------

%e 0 0

%e 1 0, 1

%e 2 0, 2

%e 3 0, 3

%e 4 0, 1, 3, 4

%e 5 0, 1, 4, 5

%e 6 0, 6

%e 7 0, 7

%e 8 0, 1, 7, 8

%e 9 0, 1, 2, 3, 6, 7, 8, 9

%e 10 0, 2, 3, 7, 8, 10

%e 11 0, 3, 8, 11

%e 12 0, 1, 3, 9, 11, 12

%e 13 0, 1, 12, 13

%e 14 0, 14

%e 15 0, 15

%e 16 0, 1, 15, 16

%o (PARI) row(n) = { select (m -> bitand(bitxor(m, m\2), bitxor(n-m, (n-m)\2))==0, [0..n]) }

%Y See A295989, A353174 and A362327 for similar sequences.

%Y Cf. A003188, A363710.

%K nonn,base,tabf

%O 0,5

%A _Rémy Sigrist_, Jun 28 2023

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Last modified September 6 15:17 EDT 2024. Contains 375715 sequences. (Running on oeis4.)