Numbers k such that k and k+1 have at least 4 but not both exactly 4 distinct prime factors.

Terms

a(0) =38570a(1) =40754a(2) =51414a(3) =51765a(4) =58695a(5) =60605a(6) =62985a(7) =66044a(8) =68585a(9) =70889a(10) =71070a(11) =73185a(12) =73814a(13) =74865a(14) =77349a(15) =82004a(16) =83265a(17) =83720a(18) =83979a(19) =85085a(20) =87009a(21) =90804a(22) =90915a(23) =91805a(24) =91884a(25) =92378a(26) =94094a(27) =94829a(28) =96459a(29) =97565