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Search: id:A137667
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| A137667 |
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The sequence alternates even and odd integers but also even and odd digits; it is monotonically increasing and a(n) is always the smallest integer fitting the pattern. |
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+0
1
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| 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 210, 301, 410, 501, 610, 701, 810, 901, 21010, 30101, 41010, 50101, 61010, 70101, 81010, 90101, 2101010, 3010101, 4101010, 5010101, 6101010, 7010101, 8101010, 9010101, 210101010, 301010101, 410101010, 501010101
(list; graph; listen)
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OFFSET
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0,3
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EXAMPLE
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The integer after "9" must be even, must start with an even digit and must be the smallest one bigger than "9"; only "210" fulfills all requirements. The integer after "210" must be odd, must start with an odd digit and must be the smallest one bigger than "210"; only "301" fits, etc.
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CROSSREFS
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Sequence in context: A032569 A039723 A002998 this_sequence A117954 A029966 A085134
Adjacent sequences: A137664 A137665 A137666 this_sequence A137668 A137669 A137670
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KEYWORD
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base,easy,nonn
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AUTHOR
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Eric Angelini (eric.angelini(AT)skynet.be), Apr 27 2008
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