Record differences for n^2 - phi(n)*sigma(n).

Terms

a(0) =0a(1) =1a(2) =2a(3) =12a(4) =28a(5) =32a(6) =52a(7) =90a(8) =124a(9) =172a(10) =324a(11) =364a(12) =612a(13) =640a(14) =756a(15) =844a(16) =912a(17) =964a(18) =1476a(19) =2052a(20) =2484a(21) =3492a(22) =4356a(23) =4644a(24) =4804a(25) =6372a(26) =7620a(27) =8164a(28) =10116a(29) =11556