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

Terms

a(0) =35a(1) =104a(2) =285a(3) =287a(4) =310a(5) =329a(6) =340a(7) =345a(8) =406a(9) =609a(10) =660a(11) =736a(12) =767a(13) =957a(14) =1067a(15) =1207a(16) =1242a(17) =1768a(18) =1786a(19) =1817a(20) =1824a(21) =2047a(22) =2288a(23) =2407a(24) =2672a(25) =2686a(26) =2714a(27) =3009a(28) =4012a(29) =4387