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 A097517 #9 May 03 2021 17:14:14
%S A097517 7,3,3,19,7,7,19,3,37,31,37,61,3,3,7,13,67,103,331,61,193,67,43,3,109,
%T A097517 31,193,151,31,3,19,7,79,13,103,151,373,181,31,79,97,151,127,3,3,79,3,
%U A097517 19,457,7,139,271,79,709,79,3,283,7,283,13,13,73,67,13,151,37,193,337
%N A097517 Consider the difference (A033873(k)) between the smallest prime > 10^k and 10^k; sequence lists the successive values of A033873(k) which are primes.
%t A097517 f[n_]:=Module[{x=10^n},NextPrime[x]-x];Select[f/@Range[0,200],PrimeQ] (* _Harvey P. Dale_, May 03 2021 *)
%Y A097517 This is the prime subsequence of A033873. Cf. A033874.
%K A097517 nonn
%O A097517 1,1
%A A097517 _Cino Hilliard_, Aug 27 2004
%E A097517 Definition corrected by _N. J. A. Sloane_, May 03 2021. Thanks to _Harvey P. Dale_ for pointing out that something was wrong.