Sum of divisors of 3-smooth numbers.

Terms

a(0) =1a(1) =3a(2) =4a(3) =7a(4) =12a(5) =15a(6) =13a(7) =28a(8) =31a(9) =39a(10) =60a(11) =40a(12) =63a(13) =91a(14) =124a(15) =120a(16) =127a(17) =195a(18) =121a(19) =252a(20) =280a(21) =255a(22) =403a(23) =363a(24) =508a(25) =600a(26) =364a(27) =511a(28) =819a(29) =847