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A032824
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Numbers whose set of base-12 digits is {1,4}.
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1
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1, 4, 13, 16, 49, 52, 157, 160, 193, 196, 589, 592, 625, 628, 1885, 1888, 1921, 1924, 2317, 2320, 2353, 2356, 7069, 7072, 7105, 7108, 7501, 7504, 7537, 7540, 22621, 22624, 22657, 22660, 23053, 23056, 23089, 23092, 27805, 27808
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
Index entries for 12-automatic sequences.
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FORMULA
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a(1)=1, a(2)=4; a(n) = 12*a(floor(n/2))+1 for n odd, otherwise a(n) = 12*a(floor((n-1)/2))+4. - Bruno Berselli, May 28 2012
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MATHEMATICA
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Select[Range[30000], MemberQ[{{1}, {4}, {1, 4}}, Union[ IntegerDigits [#, 12]]]&] (* Harvey P. Dale, Apr 02 2011 *)
Flatten[Table[FromDigits[#, 12]&/@Tuples[{1, 4}, n], {n, 5}]] (* Vincenzo Librandi, May 28 2012 *)
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PROG
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(Magma) [n: n in [1..28000] | Set(IntegerToSequence(n, 12)) subset {1, 4}]; // Vincenzo Librandi, May 28 2012
(Maxima) a[1]:1$ a[2]:4$ a[n]:= if oddp(n) then 12*a[floor(n/2)]+1 else 12*a[floor((n-1)/2)]+4$ makelist(a[n], n, 1, 40); /* Bruno Berselli, May 28 2012 */
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CROSSREFS
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Sequence in context: A301965 A191135 A268524 * A246145 A107462 A190863
Adjacent sequences: A032821 A032822 A032823 * A032825 A032826 A032827
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KEYWORD
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nonn,base,easy
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AUTHOR
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Clark Kimberling
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STATUS
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approved
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