Differences between consecutive odd primes, divided by 2.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =2a(5) =1a(6) =2a(7) =3a(8) =1a(9) =3a(10) =2a(11) =1a(12) =2a(13) =3a(14) =3a(15) =1a(16) =3a(17) =2a(18) =1a(19) =3a(20) =2a(21) =3a(22) =4a(23) =2a(24) =1a(25) =2a(26) =1a(27) =2a(28) =7a(29) =2