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 A101153 #14 Jan 17 2019 13:44:06 %S A101153 0,3,17,27,54,1727,1875,1883,6840,10781,25365,98445,137249 %N A101153 Indices of primes in sequence defined by A(0) = 79, A(n) = 10*A(n-1) - 1 for n > 0. %C A101153 Numbers n such that (710*10^n + 1)/9 is a prime. %C A101153 Numbers n such that digit 7 followed by n >= 0 occurrences of digit 8 followed by digit 9 is a prime. %C A101153 Numbers corresponding to terms <= 54 are certified primes. %C A101153 The next term after 1883 is greater than 5000. - _Ryan Propper_, Jun 16 2005 %D A101153 Klaus Brockhaus and Walter Oberschelp, Zahlenfolgen mit homogenem Ziffernkern, MNU 59/8 (2006), pp. 462-467. %H A101153 Makoto Kamada, <a href="https://stdkmd.net/nrr/7/78889.htm#prime">Prime numbers of the form 788...889</a>. %H A101153 <a href="/index/Pri#Pri_rep">Index entries for primes involving repunits</a>. %F A101153 a(n) = A103067(n) - 1. %e A101153 78889 is a prime, hence 3 is a term. %o A101153 (PARI) a=79;for(n=0,1000,if(isprime(a),print1(n,","));a=10*a-1) %o A101153 (PARI) for(n=0,1000,if(isprime((710*10^n+1)/9),print1(n,","))) %Y A101153 Cf. A000533, A002275, A103067. %K A101153 nonn,hard,more %O A101153 1,2 %A A101153 _Klaus Brockhaus_ and Walter Oberschelp (oberschelp(AT)informatik.rwth-aachen.de), Dec 03 2004 %E A101153 3 more terms from _Ryan Propper_, Jun 16 2005 %E A101153 6840 from Herman Jamke (hermanjamke(AT)fastmail.fm), Apr 28 2007 %E A101153 a(10)-a(13) from Kamada data by _Ray Chandler_, Apr 23 2015