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 A110918 #41 May 03 2024 15:41:27 %S A110918 1,2,3,4,11,12,15,19,136,144,732,5754,6602,23499,39583,74254,93356, %T A110918 94016 %N A110918 Integers n such that 10^n+91 is a prime number. %C A110918 No additional terms < 100000. %C A110918 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10091". %H A110918 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>. %H A110918 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %e A110918 n = 4 is a member: 10^4+91 = 10000+91 = 10091, which is prime. %t A110918 Select[Range[2000], PrimeQ[10^# + 91] &] (* _Vincenzo Librandi_, Nov 02 2014 *) %o A110918 (Magma) [n: n in [1..400]| IsPrime(10^n+91)]; // _Vincenzo Librandi_, Nov 02 2014 %Y A110918 Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054. %K A110918 more,nonn %O A110918 1,2 %A A110918 Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005 %E A110918 a(1)=1 added by _Vladimir Joseph Stephan Orlovsky_, May 02 2008 %E A110918 a(12)-a(15) from _Robert Price_, Dec 12 2010 %E A110918 Edited by _Ray Chandler_, Dec 23 2010 %E A110918 a(16)=74254 from _Robert Price_, Mar 03 2011 %E A110918 a(17)=92178 and a(18)=94016 from _Robert Price_, Apr 19 2011 %E A110918 a(17)=93356 corrected by _Robert Price_, Apr 19 2011 %E A110918 a(12) corrected by _Tyler Busby_, May 03 2024