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A207335 Number of minimal polynomials of 2*cos(Pi/N) with allowed degree given by A207333. 2
3, 3, 2, 4, 1, 4, 5, 2, 3, 1, 7, 1, 1, 6, 5, 6, 2, 2, 1, 9, 1, 1, 2, 1, 5, 7, 1, 1, 11, 1, 8, 1, 4, 4, 2, 13, 2, 1, 2, 1, 5, 1, 4, 2, 11, 1, 8, 1, 4, 1, 1, 2, 16, 1, 1, 4, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
For the minimal polynomials C(N,x) of 2*cos(Pi/N) with degree delta(N) see A207333.
LINKS
FORMULA
a(n) is the number of different indices N of minimal polynomials C(N,x) of 2*cos(Pi/N) with allowed degree delta(N)=A207333(n), n>=1.
EXAMPLE
a(8)=2 because there are exactly 2 values of N, namely 19 and 27 (see row no. 7 of the array A207334), for which the minimal polynomial C(N,x) has degree delta(N) = A207333(8) = 9.
CROSSREFS
Sequence in context: A249803 A350833 A064655 * A049604 A247509 A106686
KEYWORD
nonn,easy
AUTHOR
Wolfdieter Lang, Feb 19 2012
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)