Irregular triangle read by rows in which row n lists algebraic prime factors of the repunit (10^n - 1)/9 (A002275(n)).

A204846

Irregular triangle read by rows in which row n lists algebraic prime factors of the repunit (10^n - 1)/9 (A002275(n)).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =11a(4) =1a(5) =3a(6) =11a(7) =37a(8) =1a(9) =11a(10) =101a(11) =3a(12) =37a(13) =11a(14) =41a(15) =271a(16) =1a(17) =3a(18) =7a(19) =11a(20) =13a(21) =37a(22) =101a(23) =1a(24) =11a(25) =239a(26) =4649a(27) =3a(28) =37a(29) =41

External references