Counterbalanced numbers: Composite numbers k such that phi(k)/(sigma(k)-k) is an integer.

Terms

a(0) =133a(1) =403a(2) =583a(3) =713a(4) =817a(5) =2077a(6) =2623a(7) =2923a(8) =4453a(9) =4717a(10) =5311a(11) =5773a(12) =7093a(13) =7747a(14) =9313a(15) =11023a(16) =11581a(17) =11653a(18) =12877a(19) =14353a(20) =15553a(21) =19303a(22) =20803a(23) =21409a(24) =21733a(25) =21971a(26) =24307a(27) =31169a(28) =35033a(29) =39283