Numbers k such that k and k + 1 each have 9 prime divisors, counted with multiplicity.

Terms

a(0) =203391a(1) =698624a(2) =1245375a(3) =1942784a(4) =2176064a(5) =2282175a(6) =2536191a(7) =2858624a(8) =2953664a(9) =3282687a(10) =3560192a(11) =3655935a(12) =3914000a(13) =4068224a(14) =4135616a(15) =4205600a(16) =4244967a(17) =4586624a(18) =4695488a(19) =4744575a(20) =4991679a(21) =5055615a(22) =5450624a(23) =5475519a(24) =5519744a(25) =6141824a(26) =6246800a(27) =6410096a(28) =6655040a(29) =6660224