Triangle read by rows formed by the prime factors of Mersenne number 2^prime(n) - 1, n >= 1.

Terms

a(0) =3a(1) =7a(2) =31a(3) =127a(4) =23a(5) =89a(6) =8191a(7) =131071a(8) =524287a(9) =47a(10) =178481a(11) =233a(12) =1103a(13) =2089a(14) =2147483647a(15) =223a(16) =616318177a(17) =13367a(18) =164511353a(19) =431a(20) =9719a(21) =2099863a(22) =2351a(23) =4513a(24) =13264529a(25) =6361a(26) =69431a(27) =20394401a(28) =179951a(31) =193707721