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 A344468 #14 May 26 2021 02:41:59 %S A344468 4,6,9,15,22,26,33,39,49,51,55,58,62,77,85,93,94,111,155,177,178,187, %T A344468 226,262,339,355,393,515,535,551,553,622,717,718,771,781,817,871,899, %U A344468 933,989,998,1111,3777,4555,5455,5545,5554,5999,7377,7737,7773,7999,9599 %N A344468 Semiprimes k such that every permutation of the digits of k is a semiprime. %e A344468 k = 15, A001222(15) = A001222(51) = 2, thus 15 and 51 are terms; %e A344468 k = 178, A001222(178) = A001222(187) = A001222(718) = A001222(781) = A001222(817) = A001222(871) = 2, thus 178, 187, 718, 781, 817, 871 are terms. %t A344468 q[n_] := AllTrue[Permutations[IntegerDigits[n]], PrimeOmega[FromDigits[#]] == 2 &]; Select[Range[10^4], q] (* _Amiram Eldar_, May 20 2021 *) %Y A344468 Cf. A000005, A001222, A001358, A003459. %Y A344468 Subsequence of A085751 and A263106. %K A344468 nonn,base %O A344468 1,1 %A A344468 _Ctibor O. Zizka_, May 20 2021