The difference between 10^n and the lesser of the twin primes immediately before.

Terms

a(0) =5a(1) =29a(2) =119a(3) =71a(4) =11a(5) =41a(6) =29a(7) =413a(8) =809a(9) =299a(10) =239a(11) =41a(12) =1511a(13) =29a(14) =2033a(15) =359a(16) =1193a(17) =1073a(18) =1499a(19) =2261a(20) =5003a(21) =2429a(22) =1793a(23) =4331a(24) =833a(25) =5879a(26) =359a(27) =779a(28) =2813a(29) =1061