Least prime k such that k*2^n + 1 divides 2^k - 1, or 0 if no such prime exists.

Terms

a(0) =2a(1) =3a(2) =0a(3) =11a(4) =397a(5) =839a(6) =1459a(7) =2081a(8) =7297a(9) =53849a(10) =3499a(11) =70589a(12) =792277a(13) =20399a(14) =11173873a(15) =929057a(16) =232591a(17) =6782759a(18) =5834299a(19) =26812151a(20) =40269673a(21) =88529891a(22) =368454343a(23) =616767917a(24) =1167319801a(25) =709939943a(26) =38151887029a(27) =38617336361a(28) =23280518791a(29) =168046587719