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%I #13 Jun 10 2023 13:24:36
%S 1,5,9,21,29,33,41,53,65,69,81,89,105,113,125,141,153,165,173,189,209,
%T 221,233,245,249,261,273,281,285,293,309,321,329,341,345,369,393,405,
%U 413,429,441,453,473,485,509,525,545,561,581,585,593
%N a(n) = (A007520(n)-1)/2.
%C 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
%F a(n) = A186296(n)-1.
%Y Cf. A007520, A055034, A186296, A187360.
%K nonn
%O 1,2
%A _Marco Matosic_, Feb 17 2011
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