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 A135131 #18 Jan 17 2019 13:44:08 %S A135131 1,2,4,7,16,18,43,60,73,91,106,115,120,169,394,444,516,835,886,1912, %T A135131 3120,3602,5664,10188,14434,16564,23732,29058,47728,63916 %N A135131 Integers n such that 10^n + 79 is a prime number. %C A135131 If any additional terms exist, they are >40000. - _Robert Price_, Sep 25 2010 %C A135131 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "10079". %H A135131 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>. %H A135131 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %e A135131 7 is a member because 10^7+79 = 10000000+79 = 10000079, which is a prime number. %t A135131 Select[Range[1000], PrimeQ[10^# + 79] &] (* _G. C. Greubel_, Sep 28 2016 *) %Y A135131 Cf. A095688, A108052, A108050, A108312, A107083, A108049, A108054. %K A135131 more,nonn %O A135131 1,2 %A A135131 Julien Peter Benney (jpbenney(AT)gmail.com), Feb 12 2008 %E A135131 Added two terms: 10188 and 14434. _Robert Price_, Mar 22 2010 %E A135131 Added seven terms: 1912, 3120, 3602, 5664, 16564, 23732, 29058. _Robert Price_, Sep 25 2010 %E A135131 Edited by _Ray Chandler_, Dec 23 2010 %E A135131 a(29)=47728 from _Robert Price_, Dec 31 2010 %E A135131 a(30)=63916 from _Robert Price_, Jan 29 2011