Numbers k such that sigma(k+2) = sigma(k).

Terms

a(0) =33a(1) =54a(2) =284a(3) =366a(4) =834a(5) =848a(6) =918a(7) =1240a(8) =1504a(9) =2910a(10) =2913a(11) =3304a(12) =4148a(13) =4187a(14) =6110a(15) =6902a(16) =7169a(17) =7912a(18) =9359a(19) =10250a(20) =10540a(21) =12565a(22) =15085a(23) =17272a(24) =17814a(25) =19004a(26) =19688a(27) =21410a(28) =21461a(29) =24881