Table T(n,k) in which n-th row lists prime factors of 2^n + 1 (n >= 0), with repetition.

Terms

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