First result not divisible by 4 when iterating k -> k+tau(k) from 2(2n-1)^2.

Terms

a(0) =7a(1) =38a(2) =71a(3) =122a(4) =178a(5) =265a(6) =415a(7) =486a(8) =602a(9) =799a(10) =927a(11) =1230a(12) =1321a(13) =1486a(14) =1810a(15) =1951a(16) =2214a(17) =2474a(18) =2830a(19) =3194a(20) =3386a(21) =3738a(22) =4206a(23) =4639a(24) =4874a(25) =5358a(26) =5838a(27) =6222a(28) =6534a(29) =7101