The index values of the smallest and the largest n-digit primes.

Terms

a(0) =1a(1) =4a(2) =5a(3) =25a(4) =26a(5) =168a(6) =169a(7) =1229a(8) =1230a(9) =9592a(10) =9593a(11) =78498a(12) =78499a(13) =664579a(14) =664580a(15) =5761455a(16) =5761456a(17) =50847534a(18) =50847535a(19) =455052511a(20) =455052512a(21) =4118054813a(22) =4118054814a(23) =37607912018a(24) =37607912019a(25) =346065536839a(26) =346065536840