Numbers k having at least one prime factor p such that p^2 divides 2^(k-1) - 1.

Terms

a(0) =1093a(1) =3511a(2) =398945a(3) =796797a(4) =1194649a(5) =1592501a(6) =1990353a(7) =2388205a(8) =2786057a(9) =3183909a(10) =3581761a(11) =3979613a(12) =4377465a(13) =4775317a(14) =5173169a(15) =5571021a(16) =5968873a(17) =6165316a(18) =6366725a(19) =6764577a(20) =7162429a(21) =7560281a(22) =7958133a(23) =8355985a(24) =8753837a(25) =9151689a(26) =9549541a(27) =9947393a(28) =10345245