Subsequence of terms of A019278 whose sum of divisors is also a term of A019278.

Terms

a(0) =1a(1) =8a(2) =15a(3) =24a(4) =60a(5) =168a(6) =512a(7) =1023a(8) =1536a(9) =4092a(10) =10752a(11) =29127a(12) =47360a(13) =57120a(14) =116508a(15) =331520a(16) =343976a(17) =932064a(18) =1556480a(19) =1980342a(20) =3932040a(21) =4404480a(22) =106151936a(23) =238608384a(24) =251650560a(25) =312792480a(26) =5099962368a(27) =6604416000a(28) =9623577600a(29) =13460388480