Table T(n,k) in which n-th row lists prime factors of 2^n + 1 (n >= 0), without repetition.

Terms

a(0) =2a(1) =3a(2) =5a(3) =3a(4) =17a(5) =3a(6) =11a(7) =5a(8) =13a(9) =3a(10) =43a(11) =257a(12) =3a(13) =19a(14) =5a(15) =41a(16) =3a(17) =683a(18) =17a(19) =241a(20) =3a(21) =2731a(22) =5a(23) =29a(24) =113a(25) =3a(26) =11a(27) =331a(28) =65537a(29) =3