a(n) is the least x such that the cyclotomic polynomial values Phi(d,x) are prime for all d dividing n.

A072942

a(n) is the least x such that the cyclotomic polynomial values Phi(d,x) are prime for all d dividing n.

Terms

    a(0) =3a(1) =4a(2) =3a(3) =4a(4) =12a(5) =6a(6) =3a(7) =4a(8) =3a(9) =12a(10) =20a(11) =24687390a(12) =3a(13) =72a(14) =62a(15) =4a(16) =20a(17) =1102903830a(18) =12a(19) =58051620a(20) =3a(21) =1793172a(22) =468a(24) =62a(25) =882a(26) =398a(27) =75274140a(28) =6a(30) =14a(31) =1288005000

External references