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Search: id:A139310
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| A139310 |
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Has two properies: concatenation of its digits is same string as concatenation of digits of its first differences and every number appears exactly one in the sequence or in its first differences. |
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+0
2
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| 1, 12, 14, 155, 160, 211, 271, 292, 419, 548, 572, 691
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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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
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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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CROSSREFS
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Cf. A139311 (first differences), A005228, A030124.
Sequence in context: A058073 A058951 A002926 this_sequence A115402 A114443 A153047
Adjacent sequences: A139307 A139308 A139309 this_sequence A139311 A139312 A139313
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KEYWORD
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nonn,more
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com) (based on Angelini's article), Jun 08 2008
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