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A139310
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Has two properties: concatenation of its digits is same string as concatenation of digits of its first differences and every number appears exactly one of the sequence or its first differences.
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2
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1, 12, 14, 155, 160, 211, 271, 292, 419, 548, 572, 591, 645, 653, 710, 735, 744, 760, 764, 820, 873, 880, 890, 963, 1537, 1584, 2191, 2197, 2245, 2265, 2352, 2355, 11163, 11253, 11349, 11380, 11917, 11932, 12016, 12235, 12356, 12453, 12475, 12520, 12746
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| When there is a choice in choosing the next term in the first differences, choose the smallest number not yet present in either the sequence or its first differences.
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REFERENCES
| E. Angelini, "Jeux de suites", in Dossier Pour La Science, pp. 32-35, Volume 59 (Jeux math'), April/June 2008, Paris.
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LINKS
| J. Schoenfield, Table of n, a(n) for n = 1..1000
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CROSSREFS
| Cf. A139311 (first differences), A005228, A030124.
Sequence in context: A058073 A058951 A002926 * A180575 A115402 A114443
Adjacent sequences: A139307 A139308 A139309 * A139311 A139312 A139313
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KEYWORD
| nonn,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com) (based on Angelini's article), Jun 08 2008
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EXTENSIONS
| Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Apr 28 2010
Correction to a(12) and more terms from Jon E. Schoenfield (jonscho(AT)hiwaay.net), May 23 2010
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