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Search: id:A139334
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| A139334 |
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Starts with 2; has two properies: concatenation of its digits is same string as concatenation of digits of its first differences and sequence and first differences have no term in common. 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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+0
2
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| 2, 24, 28, 311, 312, 325, 337, 340, 365, 398, 405, 3808
(list; graph; listen)
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OFFSET
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1,1
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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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EXAMPLE
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The first differenres are 22, 4, 283, 1, 13, 12, 3, 25, 33, 7, 3403, ...
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CROSSREFS
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Sequence in context: A052686 A064818 A022374 this_sequence A112660 A119066 A019996
Adjacent sequences: A139331 A139332 A139333 this_sequence A139335 A139336 A139337
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KEYWORD
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nonn,more,base
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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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EXTENSIONS
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Extended through a(12) by Eric Angelini, Jul 18 2008
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