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A072540
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Numbers that are not differences between successive Ulam numbers (A002858).
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0
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OFFSET
| 1,1
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COMMENTS
| 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
a(7)>=23. The sequence continues either as 23, 26, 28, 33; or as 26, 28, 33.
23 does not appear as a difference in the first 640000000 terms of A002858 and is therefore a candidate for this sequence. However, a gap of 35 doesn't occur until 483379949 terms, so these missing gaps could eventually occur. - Jud McCranie (JudMcCranie(AT)ugaalum.uga.edu), Jun 13 2008
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REFERENCES
| Clifford A. Pickover, "Wonders of Numbers, ...", Oxford University Press, 2000
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LINKS
| C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
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CROSSREFS
| Cf. A002858, A072832.
Sequence in context: A068308 A163871 A201915 * A190449 A106837 A043098
Adjacent sequences: A072537 A072538 A072539 * A072541 A072542 A072543
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KEYWORD
| more,nonn,hard
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AUTHOR
| Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 04 2002
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EXTENSIONS
| Edited by Max Alekseyev (maxale(AT)gmail.com), Dec 19 2011
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