Positions of 3's in A264977; positions of 6's in A277330.

Terms

a(0) =3a(1) =39a(2) =75a(3) =147a(4) =207a(5) =291a(6) =411a(7) =579a(8) =819a(9) =927a(10) =1155a(11) =1635a(12) =1851a(13) =2307a(14) =2487a(15) =2583a(16) =2919a(17) =3267a(18) =3699a(19) =3903a(20) =4611a(21) =4971a(22) =5163a(23) =5835a(24) =6531a(25) =7395a(26) =7803a(27) =9219a(28) =9939a(29) =10323