Table read by rows in which row n lists divisors of (p^p-1)/(p-1) where p = prime(n).

Terms

a(0) =1a(1) =3a(2) =1a(3) =13a(4) =1a(5) =11a(6) =71a(7) =781a(8) =1a(9) =29a(10) =4733a(11) =137257a(12) =1a(13) =15797a(14) =1806113a(15) =28531167061a(16) =1a(17) =53a(18) =264031a(19) =1803647a(20) =13993643a(21) =95593291a(22) =476218721057a(24) =1a(25) =10949a(26) =1749233a(27) =2699538733a(28) =19152352117