a(n) = floor(tan(prime(n))).

Terms

a(0) =-3a(1) =-1a(2) =-4a(3) =0a(4) =-226a(5) =0a(6) =3a(7) =0a(8) =1a(9) =0a(10) =-1a(11) =-1a(12) =0a(13) =-2a(14) =-1a(15) =-1a(16) =-1a(17) =3a(18) =1a(19) =-4a(20) =0a(21) =0a(22) =3a(23) =1a(24) =-1a(25) =0a(26) =-1a(27) =0a(28) =-2a(29) =-1