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 A110983 #20 Dec 28 2023 23:30:15 %S A110983 1,3,4,16,430,727,1415,2691,3160,3904,5464,19875,65255,68524 %N A110983 Integers k such that 5*10^k + 51 is prime. %C A110983 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "50051". %C A110983 a(15) > 10^5. - _Robert Price_, Jan 28 2017 %H A110983 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>. %H A110983 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %e A110983 k = 4 is a member because: 5*10^4+51 = 5*10000+51 = 50000+51 = 50051, which is prime. %t A110983 Select[Range[1, 1000], PrimeQ[5*10^# + 51] &] (* _Julien Kluge_, Dec 15 2016 *) %Y A110983 Cf. A049054, A088274, A088275, A095688, A107083, A108049, A108050, A108052, A108054. %K A110983 more,nonn %O A110983 1,2 %A A110983 Julien Peter Benney (jpbenney(AT)ftml.net), Oct 04 2005 %E A110983 a(11)-a(12) from _Ray Chandler_, Dec 23 2010 %E A110983 Prepended a(1)=1 by _Robert Price_, Jan 28 2017 %E A110983 a(13)-a(14) from _Robert Price_, Jan 28 2017