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 A105609 Sylvester numbers for 1/(1+x^2). 3
 1, 0, -1, -2, 1, -3, -1, 2, -1, 5, -1, 1, 1, -7, 1, 2, 1, -3, -1, 1, 1, -11, -1, 1, 1, 13, -1, 1, 1, 1, -1, 2, 1, 17, 1, 1, 1, -19, 1, 1, 1, 1, -1, 1, 1, -23, -1, 1, -1, 5, 1, 1, 1, -3, 1, 1, 1, 29, -1, 1, 1, -31, 1, 2, 1, 1, -1, 1, 1, 1, -1, 1, 1, 37 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Nathaniel Johnston, Table of n, a(n) for n = 0..2500 Peter Luschny and Stefan Wehmeier, The lcm(1,2,...,n) as a product of sine values sampled over the points in Farey sequences Eric Weisstein's World of Mathematics, Sylvester Cyclotomic Number. FORMULA a(n)=product{k=1..n, if(gcd(n+1, k)=1, (I+I*exp(2*pi*I*k/(n+1))), 1)}, I=sqrt(-1). alpha(n) = product{0

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Last modified June 18 17:51 EDT 2021. Contains 345120 sequences. (Running on oeis4.)