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 A218019 #20 Feb 11 2020 10:08:01 %S A218019 1023456,1023457,1023458,1023459,1023465,1023467,1023468,1023469, %T A218019 1023475,1023476,1023478,1023479,1023485,1023486,1023487,1023489, %U A218019 1023495,1023496,1023497,1023498,1023546,1023547,1023548,1023549,1023564,1023567,1023568,1023569 %N A218019 Integers in which the number of distinct base-10 digits is 7. %C A218019 This is to A031969 as 7 is to 4. This is the 7th row of the array A(k,n) = n-th number in which the number of distinct base-10 digits is k. A031969 is the 4th row. A220063 is the 5th row. A220076 is the 6th row. Pandigital numbers A050278 is the 10th row. The subsequence of primes begins: 1023467, 1023487. %t A218019 Select[Range[1000000, 1030000], Length[Union[IntegerDigits[#]]] == 7 &] (* _T. D. Noe_, Dec 04 2012 *) %Y A218019 Cf. A031969, A050278, A220063, A220076. %K A218019 nonn,base,easy %O A218019 1,1 %A A218019 _Jonathan Vos Post_, Dec 04 2012