A261406 - OEIS

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.

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