Numbers k such that sigma(k) + 12 = sigma(k+12).

Terms

a(0) =5a(1) =7a(2) =11a(3) =17a(4) =19a(5) =29a(6) =31a(7) =41a(8) =47a(9) =59a(10) =61a(11) =65a(12) =67a(13) =71a(14) =89a(15) =97a(16) =101a(17) =127a(18) =137a(19) =139a(20) =151a(21) =167a(22) =170a(23) =179a(24) =181a(25) =199a(26) =209a(27) =211a(28) =227a(29) =229