Initial (unsafe) primes of Cunningham chains of first type with length exactly 6.

Terms

a(0) =89a(1) =63419a(2) =127139a(3) =405269a(4) =810809a(5) =1069199a(6) =1178609a(7) =1333889a(8) =1598699a(9) =1806089a(10) =1958249a(11) =2606069a(12) =2848949a(13) =3241289a(14) =3339989a(15) =3784199a(16) =3962039a(17) =4088879a(18) =4444829a(19) =4664249a(20) =4894889a(21) =4897709a(22) =5132999a(23) =5215499a(24) =5238179a(25) =6026309a(26) =6059519a(27) =6088529a(28) =6490769a(29) =6676259