A063706 - OEIS

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A063706

Cyclotomic polynomials Phi_n at x=phi, divided by sqrt(5) and rounded to nearest integer (where phi = tau = (sqrt(5)+1)/2).

1, 0, 1, 2, 2, 7, 1, 20, 4, 10, 2, 143, 2, 376, 5, 12, 21, 2583, 7, 6764, 15, 75, 34, 46367, 18, 7435, 89, 2618, 104, 832039, 25, 2178308, 987, 3400, 610, 20161, 136, 39088168, 1597, 23229, 861, 267914295, 182, 701408732, 4895, 35921, 10946, 4807526975

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

Paolo Xausa, Table of n, a(n) for n = 0..1000

MAPLE

with(numtheory); Phi_at_x := (n, y) -> subs(x=y, cyclotomic(n, x)); [seq(round(evalf(simplify(Phi_at_x(j, (sqrt(5)+1)/2))/(sqrt(5)))), j=0..120)];

MATHEMATICA

Join[{1}, Round[Simplify[Cyclotomic[Range[50], GoldenRatio]]/Sqrt[5]]] (* Paolo Xausa, Feb 27 2024 *)

CROSSREFS

Cf. A063705, A051258, A063704, A063708.

Sequence in context: A362029 A324085 A340180 * A110779 A121708 A286370