Cyclotomic polynomials at x=13.

Terms

a(0) =13a(1) =12a(2) =14a(3) =183a(4) =170a(5) =30941a(6) =157a(7) =5229043a(8) =28562a(9) =4829007a(10) =26521a(11) =149346699503a(12) =28393a(14) =4482037a(15) =753327121a(16) =815730722a(18) =4824613a(20) =810932305