a(n) = least k such that 3^k mod k = 2^n.

Terms

a(0) =2a(1) =2929a(2) =41459a(3) =2352527a(4) =144937a(5) =1055a(6) =1829903a(7) =7316185805a(8) =114491a(9) =3146746271a(10) =5028467a(11) =20299a(12) =69609309001a(13) =129433a(14) =15307006153a(15) =2149705a(16) =66469a(17) =559182815a(18) =18429503a(19) =4529951a(20) =7094711a(22) =1251548749a(23) =38088889