Concatenation of odd n and even n-th nonprime.

Terms

a(0) =10a(1) =34a(2) =58a(3) =710a(4) =914a(5) =1116a(6) =1320a(7) =1522a(8) =2130a(9) =2738a(10) =2940a(11) =3144a(12) =3346a(13) =3954a(14) =4156a(15) =4358a(16) =4562a(17) =4764a(18) =4966a(19) =5372a(20) =5980a(21) =6182a(22) =6790a(23) =6992a(24) =7194a(25) =7396a(26) =77102a(27) =81108a(28) =85114a(29) =87116