Twin natural nonprimes with nonprime number of prime factors.

Terms

a(0) =1a(1) =625a(2) =1715a(3) =1925a(4) =2125a(5) =2875a(6) =2975a(7) =3575a(8) =3773a(9) =4165a(10) =4225a(11) =4235a(12) =4625a(13) =5125a(14) =5375a(15) =5425a(16) =5635a(17) =5831a(18) =5875a(19) =5915a(20) =6517a(21) =6625a(22) =7007a(23) =7225a(24) =7315a(25) =7375a(26) =7595a(27) =7625a(28) =7735a(29) =7889