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A340441
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Square array, read by ascending antidiagonals, where row n gives all odd solutions k > 1 and n > 0 to A000120(2*n+1) = A000120((2*n+1)*k), A000120 is the Hamming weight.
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3
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3, 13, 11, 3, 205, 43, 57, 5, 3277, 171, 35, 3641, 7, 52429, 683, 21, 47, 233017, 19, 838861, 2731, 3, 79, 99, 14913081, 23, 13421773, 10923, 241, 5, 197, 187, 954437177, 37, 214748365, 43691, 7, 61681, 7, 325, 419, 61083979321, 39, 3435973837, 174763
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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If 2*n = 2^j, then T(n, m) = (1+2^(j+2*j*m))/(2*n+1) for m > 0. In particular:
T(1, m) = (1+2^(1+2*m))/3 = A007583(m),
T(2, m) = (1+2^(2+4*m))/5 = A299960(m),
T(4, m) = (1+2^(3+6*m))/9.
The third row consists of all numbers of the form (1+2^(1+b*3)+2^(2+c*3))/7, where b and c are natural numbers >= 0 and b+c > 0.
The seventh row consists of all numbers of the form (1+2^(1+b*2)+2^(2+c*2)+2^(3+d*2))/15 where b, c, and d are natural numbers >= 0 and b+c+d > 1.
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EXAMPLE
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Five initial terms of rows 1-5 are listed below:
1: 3, 11, 43, 171, 683, ...
2: 13, 205, 3277, 52429, 838861, ...
3: 3, 5, 7, 19, 23, ...
4: 57, 3641, 233017, 14913081, 954437177, ...
5: 35, 47, 99, 187, 419, ...
T(3,4) = 19 because: (3*2+1) in binary is 111 and (3*2+1)*19 = 133 in binary is 10000101, both have 3 bits set to 1.
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CROSSREFS
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KEYWORD
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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