Let d_1=1 < d_2 < d_3 < ... be the divisors of n; sequence lists positive numbers n such that for some k, n = 2(d_1 + ... + d_k).

A185961

Let d_1=1 < d_2 < d_3 < ... be the divisors of n; sequence lists positive numbers n such that for some k, n = 2(d_1 + ... + d_k).

Terms

    a(0) =2a(1) =6a(2) =12a(3) =28a(4) =40a(5) =48a(6) =224a(7) =234a(8) =496a(9) =960a(10) =8128a(11) =47616a(12) =174592a(13) =10371840a(14) =15037440a(15) =28090368a(16) =33550336a(17) =134209536a(18) =207516672a(19) =492101632a(20) =1150402560a(21) =8589869056a(22) =59205411720a(23) =137438691328

External references