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A233564
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c-squarefree numbers: positive integers which in binary are concatenation of distinct parts of the form 10...0 with nonnegative number of zeros.
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126
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0, 1, 2, 4, 5, 6, 8, 9, 12, 16, 17, 18, 20, 24, 32, 33, 34, 37, 38, 40, 41, 44, 48, 50, 52, 64, 65, 66, 68, 69, 70, 72, 80, 81, 88, 96, 98, 104, 128, 129, 130, 132, 133, 134, 137, 140, 144, 145, 152, 160, 161, 176, 192, 194, 196, 200, 208, 256, 257, 258, 260, 261
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OFFSET
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1,3
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COMMENTS
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Number of terms in interval [2^(n-1), 2^n) is the number of compositions of n with distinct parts (cf. A032020). For example, if n=6, then interval [2^5, 2^6) contains 11 terms {32,...,52}. This corresponds to 11 compositions with distinct parts of 6: 6, 5+1, 1+5, 4+2, 2+4, 3+2+1, 3+1+2, 2+3+1, 2+1+3, 1+3+2, 1+2+3.
The k-th composition in standard order (row k of A066099) is obtained by taking the set of positions of 1's in the reversed binary expansion of k, prepending 0, taking first differences, and reversing again. This gives a bijective correspondence between nonnegative integers and integer compositions. This sequence lists all numbers k such that the k-th composition in standard order is strict. For example, the sequence together with the corresponding strict compositions begins:
0: () 38: (3,1,2) 98: (1,4,2)
1: (1) 40: (2,4) 104: (1,2,4)
2: (2) 41: (2,3,1) 128: (8)
4: (3) 44: (2,1,3) 129: (7,1)
5: (2,1) 48: (1,5) 130: (6,2)
6: (1,2) 50: (1,3,2) 132: (5,3)
8: (4) 52: (1,2,3) 133: (5,2,1)
9: (3,1) 64: (7) 134: (5,1,2)
12: (1,3) 65: (6,1) 137: (4,3,1)
16: (5) 66: (5,2) 140: (4,1,3)
17: (4,1) 68: (4,3) 144: (3,5)
18: (3,2) 69: (4,2,1) 145: (3,4,1)
20: (2,3) 70: (4,1,2) 152: (3,1,4)
24: (1,4) 72: (3,4) 160: (2,6)
32: (6) 80: (2,5) 161: (2,5,1)
33: (5,1) 81: (2,4,1) 176: (2,1,5)
34: (4,2) 88: (2,1,4) 192: (1,7)
37: (3,2,1) 96: (1,6) 194: (1,5,2)
(End)
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LINKS
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EXAMPLE
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49 in binary has the following parts of the form 10...0 with nonnegative number of zeros: (1),(1000),(1). Two of them are the same. So it is not in the sequence. On the other hand, 50 has distinct parts (1)(100)(10), thus it is a term.
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MATHEMATICA
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bitPatt[n_]:=bitPatt[n]=Split[IntegerDigits[n, 2], #1>#2||#2==0&];
Select[Range[0, 300], bitPatt[#]==DeleteDuplicates[bitPatt[#]]&] (* Peter J. C. Moses, Dec 13 2013 *)
stc[n_]:=Differences[Prepend[Join@@Position[Reverse[IntegerDigits[n, 2]], 1], 0]]//Reverse;
Select[Range[0, 100], UnsameQ@@stc[#]&] (* Gus Wiseman, Apr 04 2020 *)
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CROSSREFS
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All of the following pertain to compositions in standard order (A066099):
- Partial sums from the right are A048793.
- Reversed initial intervals A164894.
- Constant compositions are A272919.
- Strictly decreasing compositions are A333255.
- Strictly increasing compositions are A333256.
- Anti-runs are counted by A333381.
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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