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A261406 Numbers n such that the norm of Phi_n(alpha), the n-th cyclotomic polynomial  evaluated at alpha, is +-1, where alpha is the Salem number defined in A073011. 0
1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 13, 16, 17, 18, 20, 21, 23, 24, 27, 28, 29, 30, 34, 37, 38, 40, 42, 44, 45, 47, 50, 52, 56, 57, 60, 63, 65, 66, 70, 74, 75, 76, 78, 84, 86, 92, 96, 98, 105, 110, 118, 132, 138, 144, 154, 160, 165, 186, 195, 204, 212, 240, 270, 286, 360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

Cohen, Henri, Leonard Lewin, and Don Zagier. "A sixteenth-order polylogarithm ladder." Experimental Mathematics 1.1 (1992): 25-34.

LINKS

Table of n, a(n) for n=1..65.

CROSSREFS

Cf. A073011.

Sequence in context: A284763 A090240 A137407 * A264387 A282843 A074137

Adjacent sequences:  A261403 A261404 A261405 * A261407 A261408 A261409

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 22 2015

STATUS

approved

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Last modified September 18 17:45 EDT 2019. Contains 327178 sequences. (Running on oeis4.)