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 A365583 #36 Aug 26 2025 21:25:30 %S A365583 1024,1253,1287,1296,1331,2048,2163,2187,2435,2500,2564,2568,2916, %T A365583 3025,3125,3216,3375,3437,3645,3729,4088,4096,4256,4375,4625,5129, %U A365583 5243,6250,6254,7128,7293,7343,7776,8256,9025,9216,9375,9512,10003,10004 %N A365583 Numbers k with property that k can be represented by the digits present in k using the operations specified in the comment, and requiring fewer digits than the number of digits in k. %C A365583 The only operations allowed are addition, subtraction, multiplication, division, exponentiation, parenthesizing, and concatenation. %C A365583 Real and imaginary intermediate values are allowed as long as the final value of the expression is an integer. - _Walter Robinson_, Aug 22 2025 %H A365583 Walter Robinson, <a href="https://github.com/WalterRobinson/MathThings/blob/master/MPDRconcatenation">Python Program</a> %e A365583 For k = 3125, k can be represented as 5^5, using only 2 digits, which is less than the length of k, 4. %e A365583 For k = 3437, k can be represented as (7^3)||7, using only 3 digits which is less than the length of k, 4. %e A365583 For k = 10003, k can be represented as ((1||0)^3)||3, using only 4 digits, which is less than the length of k, 5. %o A365583 (Python) # See Robinson link. %Y A365583 Cf. A043537, A362769. %K A365583 nonn,base,changed %O A365583 1,1 %A A365583 Valentin Miakinen and _Walter Robinson_, Sep 20 2023