a(n) = 10000*log_10(n) rounded up.

Terms

a(0) =0a(1) =3011a(2) =4772a(3) =6021a(4) =6990a(5) =7782a(6) =8451a(7) =9031a(8) =9543a(9) =10000a(10) =10414a(11) =10792a(12) =11140a(13) =11462a(14) =11761a(15) =12042a(16) =12305a(17) =12553a(18) =12788a(19) =13011a(20) =13223a(21) =13425a(22) =13618a(23) =13803a(24) =13980a(25) =14150a(26) =14314a(27) =14472a(28) =14624