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 A164920 #6 Dec 16 2018 06:41:00 %S A164920 113,139,199,211,223,277,293,397,421,443 %N A164920 Primes which are obtained at least by two ways using the iterations of the Bertrand operator (see A164917) beginning with primes of A164368. %C A164920 The sequence is connected with our sieve selecting the primes of A164368 from all primes. %H A164920 V. Shevelev, <a href="https://arxiv.org/abs/0908.2319">On critical small intervals containing primes</a>, arXiv:0908.2319 [math.NT], 2009. %e A164920 113 is in the sequence since it is obtained either by iterations of Bertrand operator beginning from 17 (17=>31=>61=>113) or by such iterations beginning with 59 (59=>113), and both of primes 17 and 59 are in A164368. %Y A164920 Cf. A006992, A164917, A164918, A104272, A164368, A164288. %K A164920 nonn,more,uned %O A164920 1,1 %A A164920 _Vladimir Shevelev_, Aug 31 2009