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Search: id:A096336
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| A096336 |
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Numbers n such that Spin(2n+1) and Spin(2n+2) have torsion index 2^c(n). |
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+0
1
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| 0, 0, 0, 1, 1, 1, 2, 3, 4, 4, 5, 5, 6, 7, 8, 9, 10, 10, 11
(list; graph; listen)
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OFFSET
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1,7
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REFERENCES
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Burt Totaro, The torsion index of the spin groups, Duke Math. J. 129 (2005), no. 2, 249-290.
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FORMULA
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c(n) is usually n-floor(log_2((n+1)n/2) + 1), but is this number plus 1 if n = 2^e+b for nonnegative integers e, b such that 2b-c(b) <= e-3
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CROSSREFS
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Sequence in context: A039733 A005374 A071991 this_sequence A081609 A046700 A110532
Adjacent sequences: A096333 A096334 A096335 this_sequence A096337 A096338 A096339
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KEYWORD
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easy,nonn
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AUTHOR
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Richard Borcherds (reb(AT)math.berkeley.edu), Jun 28 2004
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