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 A217413 #17 Apr 07 2020 23:06:47 %S A217413 380270922216319615655477248,804540132953535715766960128, %T A217413 808356196450619282354367102976,3705202243778559670466281109192704, %U A217413 29084192305393678777275954501779456 %N A217413 Numbers of the form 2^r*11^s whose decimal representations are such that each digit 0-9 appears a prime number of times. %C A217413 See the formula section for more data, and the other sequences in cross-reference for similar sequences and motivation. %F A217413 A217413(n) = 2^A217414(n) * 11^A217415(n). %e A217413 A217414(1)=71 and A217415(1)=5, so this sequence's first term is 2^71 * 11^5. It has two each of 0's, 3's, 4's, 6's, 8's and 9's; three each of 1's, 5's and 7's; and five 2's. %Y A217413 Cf. A217854, A217414, A217415, A217404, A217407, A217410, A217416, A217419, A217422, A217425, A217428, A217431. %K A217413 nonn,base,less %O A217413 1,1 %A A217413 _James G. Merickel_, Oct 03 2012