Numbers k such that both k and k+1 are exceptional (A072066).

Terms

a(0) =1215a(1) =98415a(2) =273375a(3) =413343a(4) =846368a(5) =1987983a(6) =2302911a(7) =6082047a(8) =6200144a(9) =8089712a(10) =9034496a(11) =9861183a(12) =11868848a(13) =13010463a(14) =13325391a(15) =13955247a(16) =16159743a(17) =16592768a(18) =17537552a(19) =18482336a(20) =20686832a(21) =20883663a(22) =21198591a(23) =22143375a(24) =22891328a(25) =23206256a(26) =24347871a(27) =25607583