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Search: id:A014261
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| A014261 |
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Numbers that contain odd digits only. |
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+0
9
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| 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 31, 33, 35, 37, 39, 51, 53, 55, 57, 59, 71, 73, 75, 77, 79, 91, 93, 95, 97, 99, 111, 113, 115, 117, 119, 131, 133, 135, 137, 139, 151, 153, 155, 157, 159, 171, 173, 175, 177, 179, 191, 193, 195, 197, 199, 311, 313, 315, 317, 319
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Or, numbers whose product of digits is odd.
A121759(a(n)) = a(n); A000035(A007959(a(n))) = 1. - Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Nov 30 2007
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MATHEMATICA
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f[n_Integer] := Block[{d = IntegerDigits[n], c = 0, l}, l = Length[d] - 1; If[ OddQ[ d[[ -1]]], d[[ -1]]++ ]; d[[ -1]]++; If[ d[[ -1]] > 10, c++; d[[ -1]] = 1]; While[l != 0, If[c == 1, d[[l]]++; c-- ]; If[ EvenQ[ d[[l]]], d[[l]]++ ]; If[ d[[l]] > 10, c++; d[[l]] = 1]; l-- ]; If[c == 1, d[[1]] = d[[1]] + 10]; FromDigits[d]]; NestList[f, 1, 50]
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PROGRAM
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(MAGMA) [ n : n in [1..129] | IsOdd(&*Intseq(n, 10)) ];
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CROSSREFS
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Similar to but different from A066640.
Sequence in context: A093031 A138217 A074775 this_sequence A066640 A137507 A061808
Adjacent sequences: A014258 A014259 A014260 this_sequence A014262 A014263 A014264
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KEYWORD
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nonn,base,easy
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AUTHOR
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njas
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EXTENSIONS
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More terms from rgwv, Oct 18 2002
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