Numbers k such that sigma(k) + 6 = sigma(k+6).

Terms

a(0) =5a(1) =7a(2) =11a(3) =13a(4) =17a(5) =23a(6) =31a(7) =37a(8) =41a(9) =47a(10) =53a(11) =61a(12) =67a(13) =73a(14) =83a(15) =97a(16) =101a(17) =103a(18) =104a(19) =107a(20) =131a(21) =147a(22) =151a(23) =157a(24) =167a(25) =173a(26) =191a(27) =193a(28) =223a(29) =227