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Search: id:A131095
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| A131095 |
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Triangle where n-th row contains the smallest n positive integers (listed in order) with exactly n nonleading 0's in their binary representations, and where the smallest term in the n-th row is > that the largest term in the (n-1)th row. |
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+0
2
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| 2, 4, 9, 17, 18, 20, 33, 34, 36, 40, 65, 66, 68, 72, 80, 129, 130, 132, 136, 144, 160, 257, 258, 260, 264, 272, 288, 320, 513, 514, 516, 520, 528, 544, 576, 640, 1025, 1026, 1028, 1032, 1040, 1056, 1088, 1152, 1280, 2049, 2050, 2052, 2056, 2064, 2080, 2112, 2176
(list; table; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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Binary representations of the terms in the first few rows:
10
100, 1001
10001, 10010, 10100
100001, 100010, 100100, 101000
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MAPLE
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A023416 := proc(n) local brep, i ; brep := convert(n, base, 2) ; add( 1-op(i, brep), i=1..nops(brep)) ; end: A131095 := proc(rowmax) local a, r, c ; a := 2 ; for r from 1 to rowmax do c := 1 ; while c <= r do if A023416(a) = r then printf("%d, ", a) ; c := c+1 ; fi ; a := a+1 ; od ; od ; end: A131095(10) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 15 2007
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CROSSREFS
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Cf. A081118, A131094.
Adjacent sequences: A131092 A131093 A131094 this_sequence A131096 A131097 A131098
Sequence in context: A056336 A060401 A063981 this_sequence A136379 A065026 A007502
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KEYWORD
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nonn,tabl
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AUTHOR
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Leroy Quet (qq-quet(AT)mindspring.com), Jun 14 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 15 2007
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