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 A108329 #32 Jan 25 2022 08:36:50 %S A108329 2,4,7,14,20,22,29,31,40,80,85,224,767,952,3592,4016,4187,9239,17684, %T A108329 20716,30791 %N A108329 Integers k such that 10^k - 27 is prime. %C A108329 See Kamada link - primecount.txt for terms, primesize.txt for discovery details including probable or proved primes - search on "99973". %C A108329 The next term, if one exists, is > 100000. - _Robert Price_, Apr 25 2011 %H A108329 Makoto Kamada, <a href="https://stdkmd.net/nrr/prime/">List of near-repdigit-related prime numbers</a>. %H A108329 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %e A108329 k = 7 is a term because 10^7 - 27 = 10000000 - 27 = 9999973, which is prime. %Y A108329 Cf. A089675, A095714, A092767, A176987. %K A108329 nonn,more %O A108329 1,1 %A A108329 Julien Peter Benney (jpbenney(AT)ftml.net), Jun 30 2005 %E A108329 a(18)-a(19) from Kamada data by _Robert Price_, Dec 10 2010 %E A108329 a(20)-a(21) from _Robert Price_, Dec 15 2010 %E A108329 Edited by _Ray Chandler_, Dec 23 2010