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 A177417 #14 Jun 17 2025 11:48:45 %S A177417 43,9999943,9999999943,99999999943,99999999999999943, %T A177417 9999999999999999943,999999999999999999999999999999999999943, %U A177417 9999999999999999999999999999999999999999999999943,99999999999999999999999999999999999999999999999943,9999999999999999999999999999999999999999999999999999999999943 %N A177417 Primes of the form (10^k-57). %o A177417 (Magma) [a: n in [2..250]|IsPrime(a) where a is 10^n-57]; %Y A177417 Cf. A108493. %K A177417 nonn %O A177417 1,1 %A A177417 _Vincenzo Librandi_, Dec 11 2010