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Search: id:A044075
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| A044075 |
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Numbers n such that the string 3,2 occurs in the base 4 representation of n but not of n-1. |
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+0
4
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| 14, 30, 46, 56, 62, 78, 94, 110, 120, 126, 142, 158, 174, 184, 190, 206, 222, 224, 248, 254, 270, 286, 302, 312, 318, 334, 350, 366, 376, 382, 398, 414, 430, 440, 446, 462, 478, 480, 504, 510, 526, 542, 558, 568, 574, 590, 606
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Numbers whose base 4 representation ends in 3,2 followed by some number of zeros and includes no other 3,2. - Franklin T. Adams-Watters, Dec 04 2006
Not the same as A055039 - see A124169.
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LINKS
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R. J. Mathar, Table of n, a(n) for n = 1..10000
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MAPLE
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has32 := proc(n) local shft : shft := n : while shft > 0 do if shft mod 16 = 14 then RETURN(true) ; fi : shft := floor(shft/4) : od : RETURN(false) ; end: isA044075 := proc(n) if has32(n) and not has32(n-1) then return(true): else return(false) : fi : end: n := 1 : a := 1 : while n <= 10000 do while not isA044075(a) do a := a+1 : od : printf("%d %d ", n, a) : a := a+1 : n := n+1 : od : - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 07 2006
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CROSSREFS
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Sequence in context: A053751 A063311 A055039 this_sequence A044456 A132759 A011257
Adjacent sequences: A044072 A044073 A044074 this_sequence A044076 A044077 A044078
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KEYWORD
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nonn,base
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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