This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A227950 #17 Jan 24 2024 07:56:01 %S A227950 3,5,5,7,9,11,13,13,15,17,19,21,25,27,53,81,85,183,191,307,377,409, %T A227950 475,541,565,885,1065,1399,1489,2653,4523,4565,5773,7777,14281 %N A227950 Number of decimal digits in the increasing sequence of primes obtainable by concatenating successive decrements from some power of 10. %e A227950 1000999998997 is one of the primes described and provides a value of 13 in this sequence, with 1000000999999 providing the other (A227949(7) and A227949(8), in opposite order for the purposes of the FORMULA at that sequence (technically)). %Y A227950 Cf. A227949, A227951. %K A227950 nonn,base,more %O A227950 1,1 %A A227950 _James G. Merickel_, Aug 22 2013