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A356149
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Irregular table T(n, k), n > 0, k = 1..A356148(n), read by rows; the n-th row contains, in ascending order, the distinct positive integers whose binary expansion appears as a substring in the binary expansion of n or its complement.
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3
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1, 1, 2, 1, 3, 1, 2, 3, 4, 1, 2, 5, 1, 2, 3, 6, 1, 3, 7, 1, 2, 3, 4, 7, 8, 1, 2, 3, 4, 6, 9, 1, 2, 5, 10, 1, 2, 3, 4, 5, 11, 1, 2, 3, 4, 6, 12, 1, 2, 3, 5, 6, 13, 1, 2, 3, 6, 7, 14, 1, 3, 7, 15, 1, 2, 3, 4, 7, 8, 15, 16, 1, 2, 3, 4, 6, 7, 8, 14, 17, 1, 2, 3, 4, 5, 6, 9, 13, 18
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OFFSET
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1,3
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COMMENTS
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Leading 0's in binary expansions are ignored.
The n-th contains the n-th row of A165416.
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LINKS
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FORMULA
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T(n, 1) = 1.
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EXAMPLE
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Table T(n, k) begins:
1;
1, 2;
1, 3;
1, 2, 3, 4;
1, 2, 5;
1, 2, 3, 6;
1, 3, 7;
1, 2, 3, 4, 7, 8;
1, 2, 3, 4, 6, 9;
1, 2, 5, 10;
1, 2, 3, 4, 5, 11;
1, 2, 3, 4, 6, 12;
1, 2, 3, 5, 6, 13;
1, 2, 3, 6, 7, 14;
1, 3, 7, 15;
1, 2, 3, 4, 7, 8, 15, 16;
...
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PROG
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(PARI) row(n) = { my (b=binary(n)); setbinop((i, j) -> my (s=fromdigits(b[i..j], 2)); if (b[i], s, 2^(j-i+1)-1-s), [1..#b]) }
(Python)
def row(n):
N = n.bit_length()
c, s = ((1<<N)-1)^n, set()
for i in range(N):
for l in range(N-i):
mask = ((2<<l)-1) << i
s.add((mask&n) >> i)
s.add((mask&c) >> i)
return sorted(s - {0})
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CROSSREFS
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KEYWORD
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nonn,base,tabf
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AUTHOR
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STATUS
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approved
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