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 A349275 #7 Nov 12 2021 21:56:41 %S A349275 469,649,694,4469,4694,4699,4946,6499,6649,6694,9446,9466,9469,9946, %T A349275 44669,44966,44969,46469,46946,46969,46994,46999,49466,49649,49694, %U A349275 49699,49969,64469,64649,64669,64949,64994,66469,66494,66694,69449,69469,69494,69694,69949,94469,94669,94699,94969,96449,96494,96649,96946,96949,96994,99646,99649,444694 %N A349275 Semiprimes with only semiprime digits, each appearing at least once. %C A349275 Each digits 4, 6, 9 occur at least once. Minimal difference is 3. %o A349275 (PARI) is(n)=bigomega(n)==2 && Set(digits(n))==[4, 6, 9] \\ _Charles R Greathouse IV_, Nov 12 2021 %Y A349275 Cf. A001358. %Y A349275 Subsequence of A107342. %K A349275 nonn,base %O A349275 1,1 %A A349275 _Zak Seidov_, Nov 12 2021