a(n)=k such that prime(k) is the prime q<prime(n) for which (prime(n) mod q) is maximal.

Terms

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