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Search: id:A072540
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| A072540 |
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Numbers that are not differences between successive Ulam numbers (A002858) (Version 1). |
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+0
2
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OFFSET
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1,1
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COMMENT
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Unfortunately, it appears that the entries are all conjectural. I am not aware of any proofs that the listed numbers can never appear. The terms shown are those listed by Pickover. - N. J. A. Sloane (njas(AT)research.att.com), Jun 19 2008
23 does not appear as a difference in the first 640000000 terms of A002858 and is therefore a candidate for this sequence (see A140394). However, a gap of 35 doesn't occur until 483379949 terms, so these missing gaps could eventually occur. - Jud McCranie (j.mccranie(AT)comcast.net), Jun 13 2008
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REFERENCES
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Clifford A. Pickover, "Wonders of Numbers, ...", Oxford University Press, 2000
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LINKS
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C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
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CROSSREFS
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Cf. A140394 (another version), A002858, A072832.
Sequence in context: A068308 A163871 A140394 this_sequence A106837 A043098 A039276
Adjacent sequences: A072537 A072538 A072539 this_sequence A072541 A072542 A072543
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KEYWORD
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more,nonn,hard
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 04 2002
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