Nonsquarefree numbers such that n-1 is prime and n+1 is square.

Terms

a(0) =8a(1) =24a(2) =48a(3) =80a(4) =168a(5) =224a(6) =360a(7) =440a(8) =728a(9) =840a(10) =1088a(11) =1224a(12) =1368a(13) =1848a(14) =2208a(15) =2400a(16) =3024a(17) =3720a(18) =3968a(19) =4760a(20) =5040a(21) =5624a(22) =5928a(23) =7920a(24) =8648a(25) =10608a(26) =11448a(27) =13688a(28) =14160a(29) =14640