Distances between successive 2's in sequence A001223 of differences between consecutive primes.

Terms

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