Number of decimal digits in the n-th term of A006960.

Terms

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