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Search: id:A136414
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| A136414 |
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Put the natural numbers together without spaces and read them two at a time advancing one space each time. |
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+0
3
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| 12, 23, 34, 45, 56, 67, 78, 89, 91, 10, 1, 11, 11, 12, 21, 13, 31, 14, 41, 15, 51, 16, 61, 17, 71, 18, 81, 19, 92, 20, 2, 21, 12, 22, 22, 23, 32, 24, 42, 25, 52, 26, 62, 27, 72, 28, 82, 29, 93, 30, 3, 31, 13, 32, 23, 33, 33, 34, 43, 35, 53, 36, 63, 37, 73, 38, 83, 39, 94, 40, 4, 41, 14
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(n) = A162711(n,2) for n>1. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 11 2009]
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FORMULA
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a(n) = 10*A007376(n) + A007376(n+1). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 11 2009]
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EXAMPLE
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34 is the third entry because the natural numbers written together look like 1234567891011 and reading them off two at a time produces 12,23,34...
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CROSSREFS
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Cf. A001704.
Sequence in context: A088783 A029756 A104340 this_sequence A017401 A004960 A098953
Adjacent sequences: A136411 A136412 A136413 this_sequence A136415 A136416 A136417
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KEYWORD
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easy,nonn,base
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AUTHOR
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Ben Thurston (benthurston27(AT)yahoo.com), Mar 31 2008
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EXTENSIONS
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More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jul 11 2009
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