A063697 - OEIS

A063697

Positions of positive coefficients in cyclotomic polynomial Phi_n(x), A063696 in binary.

0, 10, 11, 111, 101, 11111, 101, 1111111, 10001, 1001001, 10101, 11111111111, 10001, 1111111111111, 1010101, 100101001, 100000001, 11111111111111111, 1000001, 1111111111111111111, 100010001, 1001001001001, 10101010101

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..22.

Index entries for cyclotomic polynomials, positions of coefficients

EXAMPLE

Phi_15(x) = x^8 - x^7 + x^5 - x^4 + x^3 - x + 1, thus the 1-bits of a(15) are at positions 0,3,5 and 8, thus we get a(15) = 100101001

MAPLE

map(convert, A063696, binary);

CROSSREFS

Cf. A063699, A063671, A063672.

Sequence in context: A287948 A287626 A059458 * A058943 A222473 A361990

Adjacent sequences: A063694 A063695 A063696 * A063698 A063699 A063700

KEYWORD

nonn,base

AUTHOR

Antti Karttunen, Aug 03 2001

EXTENSIONS

a(0) corrected by Sean A. Irvine, May 08 2023

STATUS

approved