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 A106808 #10 Sep 20 2024 11:53:40 %S A106808 12,44,75,237,3186,4379,5535,6363,13707,14463 %N A106808 Numbers k such that 4440011 * 10^k - 1 is prime. %C A106808 These are primes with square digits and they have all been certified. No more terms up to 37000. Primality proof for the largest: PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8] Primality testing 4440011*10^14463-1 [N+1, Brillhart-Lehmer-Selfridge] Running N+1 test using discriminant 3, base 1+sqrt(3) 4440011*10^14463-1 is prime! (268.8294s+0.0548s) %H A106808 R. Ondrejka, <a href="http://www.utm.edu/research/primes/lists/top_ten/">The Top Ten: a Catalogue of Primal Configurations</a>. %o A106808 (PARI) is(n)=ispseudoprime(4440011*10^n-1) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A106808 Cf. A061246. %K A106808 nonn %O A106808 1,1 %A A106808 _Jason Earls_, May 18 2005