Composite numbers k such that k - phi(k) divides sigma(k) - k.

Terms

a(0) =12a(1) =56a(2) =260a(3) =992a(4) =1320a(5) =1976a(6) =2156a(7) =2754a(8) =3696a(9) =5520a(10) =13800a(11) =16256a(12) =19872a(13) =22560a(14) =23688a(15) =25232a(16) =41072a(17) =87000a(18) =89964a(19) =133984a(20) =145888a(21) =366720a(22) =785808a(23) =851760a(24) =1100864a(25) =1235052a(26) =1270208a(27) =1439552a(28) =1470720a(29) =2129400