Primes from merging of 4 successive digits in decimal expansion of cos(1).

Terms

a(0) =3023a(1) =8681a(2) =6607a(3) =4297a(4) =6037a(5) =2767a(6) =5381a(7) =3947a(8) =6451a(9) =4517a(10) =5179a(11) =7951a(12) =3089a(13) =9343a(14) =4357a(15) =3571a(16) =5717a(17) =6337a(18) =1663a(19) =5417a(20) =7949a(21) =2543a(22) =3359a(23) =3517a(24) =7573a(25) =1543a(26) =4327a(27) =7549a(28) =5449a(29) =1151