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A098645
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Start with a(1) = 1. For n>1, choose a(n) to be the smallest number > a(n-1) consistent with the condition that "the a(n)-th digit is a 1 and no 1's occur in other positions" is true for all n.
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10
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1, 3, 10, 20, 22, 31, 32, 33, 34, 35, 41, 51, 52, 53, 54, 55, 111, 112, 200, 210, 220, 222, 231, 1111, 2000, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2020, 2022, 2023, 2024, 2031, 10000, 20000, 20002, 20003, 20004, 20005, 20006, 20007, 20008, 20009
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| If we change ">a(n-1)" to "not already used", we get 1,3,10,6,11,7,21,13,15,17,19,101... - David Wasserman (dwasserm(AT)earthlink.net), Feb 26 2008
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EXAMPLE
| The first digit of the sequence is a "1", the 3rd digit also, then the 10th, the 11th, etc.
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CROSSREFS
| Cf. A098670. See A114134 for another version.
Sequence in context: A048343 A056789 A174476 * A089693 A194116 A005997
Adjacent sequences: A098642 A098643 A098644 * A098646 A098647 A098648
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KEYWORD
| base,easy,nonn
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AUTHOR
| Eric Angelini (eric.angelini(AT)kntv.be), Oct 27 2004
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EXTENSIONS
| Entry revised by Eric Angelini and N. J. A. Sloane (njas(AT)research.att.com), Feb 03 2006.
More terms from David Wasserman (dwasserm(AT)earthlink.net), Feb 26 2008
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