%I #5 Aug 22 2015 12:49:42
%S 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,
%T 40,42,44,45,47,50,52,56,57,60,63,65,66,70,74,75,76,78,84,86,92,96,98,
%U 105,110,118,132,138,144,154,160,165,186,195,204,212,240,270,286,360
%N Numbers n such that the norm of Phi_n(alpha), the nth cyclotomic polynomial evaluated at alpha, is +1, where alpha is the Salem number defined in A073011.
%D Cohen, Henri, Leonard Lewin, and Don Zagier. "A sixteenthorder polylogarithm ladder." Experimental Mathematics 1.1 (1992): 2534.
%Y Cf. A073011.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, Aug 22 2015
