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Search: id:A126071
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| A126071 |
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Number of bases (2 <= b <= n+1) in which n has symmetrical digits. |
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+0
2
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| 1, 1, 2, 2, 3, 2, 3, 3, 3, 4, 2, 3, 3, 3, 4, 4, 4, 4, 2, 4, 5, 3, 3, 5, 3, 5, 4, 5, 3, 4, 4, 4, 4, 4, 3, 6, 3, 4, 3, 6, 3, 5, 3, 4, 5, 5, 2, 6, 3, 5
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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a(n) >= 1, since n will always have a single "digit" in base n+1.
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EXAMPLE
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From bases 2 to 9 respectively, 8 can be represented as: 1000, 22, 20, 13, 12, 11, 10, 8. Three of those are symmetrical (22, 11, 8) and so a(8) = 3.
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CROSSREFS
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Cf. A016026.
Sequence in context: A076223 A076235 A057941 this_sequence A105264 A063787 A129843
Adjacent sequences: A126068 A126069 A126070 this_sequence A126072 A126073 A126074
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KEYWORD
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nonn
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AUTHOR
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Paul Richards (pr(AT)paulrichards.me.uk), Mar 01 2007
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