Composite n such that sigma(n)-phi(n) divides sigma(n)+phi(n).

Terms

a(0) =15a(1) =35a(2) =95a(3) =119a(4) =143a(5) =209a(6) =287a(7) =319a(8) =323a(9) =357a(10) =377a(11) =527a(12) =559a(13) =779a(14) =899a(15) =923a(16) =989a(17) =1007a(18) =1045a(19) =1189a(20) =1199a(21) =1343a(22) =1349a(23) =1763a(24) =1919a(25) =2159a(26) =2261a(27) =2507a(28) =2639a(29) =2759