Numbers k such that k and k+1 have the same number and sum of divisors.

Terms

a(0) =14a(1) =1334a(2) =1634a(3) =2685a(4) =33998a(5) =42818a(6) =64665a(7) =84134a(8) =109214a(9) =122073a(10) =166934a(11) =289454a(12) =383594a(13) =440013a(14) =544334a(15) =605985a(16) =649154a(17) =655005a(18) =792855a(19) =1642154a(20) =2284814a(21) =2305557a(22) =2913105a(23) =3571905a(24) =3682622a(25) =4701537a(26) =5181045a(27) =6431732