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Search: id:A132140
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| A132140 |
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Numbers containing no zeros in ternary representation and with an inital 1. |
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+0
4
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| 1, 4, 5, 13, 14, 16, 17, 40, 41, 43, 44, 49, 50, 52, 53, 121, 122, 124, 125, 130, 131, 133, 134, 148, 149, 151, 152, 157, 158, 160, 161, 364, 365, 367, 368, 373, 374, 376, 377, 391, 392, 394, 395, 400, 401, 403, 404, 445, 446, 448, 449, 454, 455, 457, 458, 472
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Intersection of A032924 and A132141;
A132138(A132139(a(n))) = 1.
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LINKS
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R. Zumkeller, Table of n, a(n) for n = 1..10000
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EXAMPLE
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14 is in the sequence because its ternary representation is 112; 15 is not in the sequence because its ternary representation is 120.
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MAPLE
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a:=proc(n) local nn, L: nn:=convert(n, base, 3): L:=nops(nn): if nn[L]=1 and 0 < product(nn[j], j=1..L) then n else end if end proc: seq(a(n), n=1..500); - Emeric Deutsch (deutsch(AT)duke.poly.edu), Sep 09 2007
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CROSSREFS
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Cf. A007089.
Sequence in context: A123102 A028272 A003969 this_sequence A102703 A098868 A087882
Adjacent sequences: A132137 A132138 A132139 this_sequence A132141 A132142 A132143
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KEYWORD
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nonn,base
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 20 2007
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