Composite numbers that are equal to the sum of the first k composites for some k.

Terms

a(0) =4a(1) =10a(2) =18a(3) =27a(4) =49a(5) =63a(6) =78a(7) =94a(8) =112a(9) =132a(10) =153a(11) =175a(12) =224a(13) =250a(14) =305a(15) =335a(16) =400a(17) =434a(18) =469a(19) =505a(20) =543a(21) =582a(22) =622a(23) =664a(24) =708a(25) =753a(26) =799a(27) =847a(28) =896a(29) =946