A186297 a(n) = (A007520(n)-1)/2.

1, 5, 9, 21, 29, 33, 41, 53, 65, 69, 81, 89, 105, 113, 125, 141, 153, 165, 173, 189, 209, 221, 233, 245, 249, 261, 273, 281, 285, 293, 309, 321, 329, 341, 345, 369, 393, 405, 413, 429, 441, 453, 473, 485, 509, 525, 545, 561, 581, 585, 593

Offset: 1

Author

Marco Matosic, Feb 17 2011

Keywords

• nonn

Comments

a(n) = A055034(A007520(n)), n >= 1. This is the degree of the minimal polynomial C(A007520(n) ,x) of 2*cos(Pi/A007520(n)) (see A187360). a(n) is of course congruent 1 (mod 4). - Wolfdieter Lang, Oct 24 2013

Crossrefs

Cf. A007520, A055034, A186296, A187360.

Formula

a(n) = A186296(n)-1.