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Search: id:A137217
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| A137217 |
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A self-describing sequence: 2 odd digits between two even, then 3 odd digits between two even, then 5 odd digits between two even, then 6, then 7... The length of each run of odd digits is given by the sequence itself (the smallest available integer is used when needed). Zero is an even digit. |
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+0
1
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| 2, 3, 5, 6, 7, 9, 10, 11, 13, 14, 15, 17, 19, 21, 31, 33, 35, 41, 51, 53, 55, 57, 61, 71, 73, 75, 77, 78, 79, 91, 93, 95, 97, 98, 99, 111, 113, 115, 116, 117, 119, 131, 133, 134, 135, 137, 139, 151, 153, 211, 311, 313, 315, 317, 319, 411, 511, 513, 515, 517, 519, 530
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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Runs of odd digits are between brackets:
Seq: 2,(3,5),6,(7,9,1)0,(11,13,1)4,(15,17,19),2(1,31,33,35),4(1,
Runs:....2........3.........5...........6............7.....= sequence itself.
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CROSSREFS
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Cf. A135604.
Adjacent sequences: A137214 A137215 A137216 this_sequence A137218 A137219 A137220
Sequence in context: A092418 A004195 A083347 this_sequence A023705 A065896 A099308
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KEYWORD
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base,nonn
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AUTHOR
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Eric Angelini (eric.angelini(AT)skynet.be), Mar 06 2008
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