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A059870
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Numbers n such that there exist no palindromic octagonal numbers of length n.
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4
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2, 3, 5, 6, 7, 8, 10, 11, 15, 17, 18, 20, 22, 23, 26, 31, 34
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..17.
P. De Geest, Palindromic octagonals
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CROSSREFS
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Cf. A034822, A034307, A059868, A059869, A000567, A057106, A057107.
Sequence in context: A137620 A028765 A181807 * A179813 A191914 A145353
Adjacent sequences: A059867 A059868 A059869 * A059871 A059872 A059873
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KEYWORD
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nonn,base,hard
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AUTHOR
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Patrick De Geest, Feb 15 2000
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EXTENSIONS
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a(13)-a(17) from World!Of Numbers link entered by Michel Marcus, Mar 04 2014
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STATUS
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approved
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