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 A347200 #23 Oct 13 2021 10:52:19 %S A347200 1531,2113,2131,2311,10531 %N A347200 Primes p with the following property: let d_1, d_2, ... be the distinct digits occurring in the decimal expansion of p. Then for each d_i, dropping all the digits d_i from p produces a prime number, and for each digit pair (d_i, d_j), dropping all the digits d_i and all the digits d_j from p also produces a prime number. Leading 0's are not allowed. %C A347200 a(6) > 10^10. %C A347200 a(6) <= 2111111111111111111111113 (25 digits). - _Jon E. Schoenfield_, Aug 22 2021 %e A347200 With 2113, omitting all instances of 1's gives 23, 2's gives 113, 3's gives 211, 1's and 2's gives 3, 1's and 3's gives 2, and 2's and 3's gives 11. All of these are prime numbers. %Y A347200 Cf. A057876. %K A347200 nonn,base,more %O A347200 1,1 %A A347200 _Musab Akbas_, Aug 22 2021