Denominators of Bernoulli numbers which are == 6 (mod 9).

Terms

a(0) =6a(1) =42a(2) =330a(3) =510a(4) =690a(5) =798a(6) =870a(7) =1410a(8) =1518a(9) =1590a(10) =1770a(11) =1806a(12) =2490a(13) =3102a(14) =3210a(15) =3318a(16) =3894a(17) =4110a(18) =4326a(19) =4470a(20) =4686a(21) =5010a(22) =5190a(23) =5370a(24) =5478a(25) =6486a(26) =6810a(27) =7062a(28) =7890a(29) =8070