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 A382380 #16 Apr 25 2025 20:40:41 %S A382380 3,5,7,9,110,211,312,413,514,615,716,817,918,1111,1212,1313,1414,1515, %T A382380 1616,1717,1818,1919,2112,2213,2314,2415,2516,2617,2718,2819,2920, %U A382380 3113,3214,3315,3416,3517,3618,3719,3820,3921,4114,4215,4316,4417,4518,4619,4720,4821,4922,5115,5216,5317,5418 %N A382380 Greater of twin self numbers, i.e., larger member of the pair of self numbers differing by 2. %C A382380 The number of twin self-numbers up to 10^n (for n > 2) is 9 * 10^(n-3) + 4. This has been verified up to n = 10. %H A382380 Shyam Sunder Gupta, <a href="/A382380/b382380.txt">Table of n, a(n) for n = 1..9004</a> %H A382380 Shyam Sunder Gupta, <a href="https://doi.org/10.1007/978-981-97-2465-9_9">On Some Marvellous Numbers of Kaprekar</a>, Exploring the Beauty of Fascinating Numbers, Springer (2025) Ch. 9, 275-315. %F A382380 a(n) = A374101(n) + 2. %Y A382380 Cf. A003052, A374101. %K A382380 nonn,base %O A382380 1,1 %A A382380 _Shyam Sunder Gupta_, Mar 23 2025