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 A305993 #26 Sep 30 2024 13:02:34 %S A305993 2,5,7,13,1093,797161 %N A305993 Base-3 circular primes: Numbers k for which all cyclic shifts of their base-3 expansions give base-3 expansions of prime numbers. %C A305993 Numbers k for which all cyclic shifts of their base-3 expansions give base-3 expansions of prime numbers. %C A305993 Not known to be infinite. %C A305993 No other terms <= 10^7. %C A305993 No other terms <= 10^11. - _Lucas A. Brown_, Sep 20 2024 %H A305993 Lucas A. Brown, <a href="https://github.com/lucasaugustus/oeis/blob/main/A305993.py">Python program</a>. %e A305993 For example, 7 in base 3 is 21, and both 21 and 12 represent primes in base 3. %Y A305993 The base-10 analog of this sequence is A068652. %Y A305993 Cf. A272106. %K A305993 nonn,base,more,hard %O A305993 1,1 %A A305993 _Jeffrey Shallit_, Jun 16 2018 %E A305993 New name from _Lucas A. Brown_, Sep 24 2024