Divisors of 280.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =7a(5) =8a(6) =10a(7) =14a(8) =20a(9) =28a(10) =35a(11) =40a(12) =56a(13) =70a(14) =140a(15) =280