Lengths of runs of the initial digits of semiprimes in decimal representation, cf. A239634.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =4a(5) =5a(6) =2a(7) =4a(8) =3a(9) =2a(10) =4a(11) =4a(12) =28a(13) =32a(14) =32a(15) =27a(16) =33a(17) =26a(18) =30a(19) =28a(20) =29a(21) =278a(22) =264a(23) =264a(24) =260a(25) =257a(26) =245a(27) =262a(28) =252a(29) =244