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Search: id:A043631
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| A043631 |
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Numbers n such that base 9 representation has exactly 2 runs. |
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+0
1
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| 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32, 33, 34, 35, 36, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 54, 55, 56, 57, 58, 59, 61, 62, 63, 64, 65, 66, 67, 68, 69, 71, 72, 73, 74, 75, 76, 77, 78, 79, 81, 90, 92, 93, 94, 95
(list; graph; listen)
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OFFSET
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1,1
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MAPLE
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rlen := proc(n, ba) local rs, s, dgs, i ; rs :=0 ; s := 0; dgs := convert(n, base, ba) ; for i from 1 to nops(dgs) do if s = 0 then s :=1 ; else if op(i, dgs) <> op(i-1, dgs) then rs := rs+1 ; s :=1 ; else s :=s+1 ; fi; fi; od: rs := rs+1 ; RETURN (rs) ; end: for n from 1 to 200 do if rlen(n, 9) = 2 then printf("%d, ", n) ; fi; od: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 20 2008]
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CROSSREFS
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Sequence in context: A107576 A043698 A031954 this_sequence A043457 A031078 A071217
Adjacent sequences: A043628 A043629 A043630 this_sequence A043632 A043633 A043634
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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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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 20 2008
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