Numbers k such that 3k - 1 divides 3^k - 1 and 3 does not divide k.

Terms

a(0) =1a(1) =175952a(2) =348880a(3) =649078a(4) =951625a(5) =1495472a(6) =1944320a(7) =3140852a(8) =3483200a(9) =3643270a(10) =4359040a(11) =4703776a(12) =6513584a(13) =8170904a(14) =9854200a(15) =11005568a(16) =11831890a(17) =12149872a(18) =12828200a(19) =12910928a(20) =18095630a(21) =18964400a(22) =22034516a(23) =43599424a(24) =62849024a(25) =66322480a(26) =82159588a(27) =85181600