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Search: id:A059870
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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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+0
5
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| 2, 3, 5, 6, 7, 8, 10, 11, 15, 17, 18, 20
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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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: A084116 A137620 A028765 this_sequence A145353 A013936 A076437
Adjacent sequences: A059867 A059868 A059869 this_sequence 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 (pdg(AT)worldofnumbers.com), Feb 15 2000.
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