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 A046507 #16 Feb 16 2025 08:32:39 %S A046507 186889,188869,246889,248869,264889,269779,279679,279967,284689, %T A046507 288389,288649,288839,296797,297967,376679,376769,377779,379667, %U A046507 379777,426889,444869,467879,467897,468289,468683,469787,469877,478679,478697,478769 %N A046507 Primes with multiplicative persistence value 7. %H A046507 Daniel Mondot, <a href="/A046507/b046507.txt">Table of n, a(n) for n = 1..10000</a> %H A046507 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MultiplicativePersistence.html">Multiplicative Persistence</a> %e A046507 186889 -> [ 27648 ][ 2688 ][ 768 ][ 336 ][ 54 ][ 20 ][ 0 ] -> one digit in seven steps. %Y A046507 Cf. A046500, A046516. %K A046507 nonn,base %O A046507 1,1 %A A046507 _Patrick De Geest_, Sep 15 1998