n satisfying sigma(n+1) = sigma(n-1).

Terms

a(0) =34a(1) =55a(2) =285a(3) =367a(4) =835a(5) =849a(6) =919a(7) =1241a(8) =1505a(9) =2911a(10) =2914a(11) =3305a(12) =4149a(13) =4188a(14) =6111a(15) =6903a(16) =7170a(17) =7913a(18) =9360a(19) =10251a(20) =10541a(21) =12566a(22) =15086a(23) =17273a(24) =17815a(25) =19005a(26) =19689a(27) =21411a(28) =21462a(29) =24882