Composite integers k such that sigma(k) | (k + 1)*tau(k) where tau is number of divisors of k.

Terms

a(0) =20a(1) =35a(2) =104a(3) =207a(4) =399a(5) =464a(6) =650a(7) =1519a(8) =1952a(9) =2015a(10) =2774a(11) =2915a(12) =2975a(13) =4454a(14) =11339a(15) =22847a(16) =32318a(17) =63503a(18) =97019a(19) =122499a(20) =130304a(21) =352835a(22) =522752a(23) =924482a(24) =1949375a(25) =7366463a(26) =8382464a(27) =9486399a(28) =15857855a(29) =30222023