Divisors of 520.

Terms

a(0) =1a(1) =2a(2) =4a(3) =5a(4) =8a(5) =10a(6) =13a(7) =20a(8) =26a(9) =40a(10) =52a(11) =65a(12) =104a(13) =130a(14) =260a(15) =520