Triangle of divisors of 105^n, each number occurring once.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =15a(5) =21a(6) =35a(7) =105a(8) =9a(9) =25a(10) =45a(11) =49a(12) =63a(13) =75a(14) =147a(15) =175a(16) =225a(17) =245a(18) =315a(19) =441a(20) =525a(21) =735a(22) =1225a(23) =1575a(24) =2205a(25) =3675a(26) =11025a(27) =27a(28) =125a(29) =135