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Search: id:A082561
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| A082561 |
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a(1)=1, a(n)=3*a(n-1) if n is not a multiple of 3, or a(n)=a(n/3)+1 if n is a multiple of 3. |
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1
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| 1, 3, 2, 6, 18, 4, 12, 36, 3, 9, 27, 7, 21, 63, 19, 57, 171, 5, 15, 45, 13, 39, 117, 37, 111, 333, 4, 12, 36, 10, 30, 90, 28, 84, 252, 8, 24, 72, 22, 66, 198, 64, 192, 576, 20, 60, 180, 58, 174, 522, 172, 516, 1548, 6, 18, 54, 16, 48, 144, 46, 138, 414, 14, 42, 126, 40, 120
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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b(1)=1, b(n)=3*b(n/3) if n is a multiple of 3, or b(n)=b(n-1)+1 if n is not a multiple of 3 produces the sequence 1, 2, 3, 4, ...
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PROGRAM
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(PARI) a(n)=if(n<2, 1, if(n%3, 3*a(n-1), 1+a(n/3)))
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CROSSREFS
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Sequence in context: A073883 A074718 A007812 this_sequence A110768 A140230 A025240
Adjacent sequences: A082558 A082559 A082560 this_sequence A082562 A082563 A082564
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), May 04 2003
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