Least number k such that d(k-1) + d(k+1) = n, where d(k) is the number of divisors of k.

Terms

a(0) =2a(1) =4a(2) =3a(3) =14a(4) =5a(5) =7a(6) =15a(7) =11a(8) =17a(9) =19a(10) =35a(11) =29a(12) =65a(13) =41a(14) =101a(15) =79a(16) =143a(17) =71a(18) =197a(19) =161a(20) =323a(21) =169a(22) =2917a(23) =181a(24) =577a(25) =239a(26) =575a(27) =629a(28) =899a(29) =419