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Search: id:A065086
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| A065086 |
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Number of n-digit biquanimous numbers in base 10 not allowing leading zeros. |
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+0
2
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| 1, 9, 126, 1920, 27190, 347168, 3990467, 42744527, 440764556, 4464045276, 44863859589, 449488519847, 4498059105204, 44992451829730, 449969622539954, 4499873022468708, 44999449703306768, 449997540235466340, 4499988731927483569
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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A biquanimous number (A064544) is a number whose digits can be split into two groups with equal sums.
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REFERENCES
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Bill Thurston (wpt(AT)math.ucdavis.edu), personal communication.
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EXAMPLE
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a(1) = 1 since 0 is the only 1-digit biquam. a(2) = 9 because there are 9 2-digit biquams, namely 11, 22, 33, 44, 55, 66, 77, 88, and 99.
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CROSSREFS
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Cf. A064544, A065023, A065025, A065024.
Sequence in context: A078422 A064199 A092343 this_sequence A065707 A034301 A092651
Adjacent sequences: A065083 A065084 A065085 this_sequence A065087 A065088 A065089
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KEYWORD
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nonn
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net), Nov 07 2001
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