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 A382456 #5 Apr 01 2025 23:15:12 %S A382456 3,6,21,115,836,6943,63113,585517,5263827,45808290,398309972 %N A382456 Number of self-primes <= 10^n. %H A382456 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. %Y A382456 Cf. A003052, A006880, A006378, A382452. %K A382456 nonn,base,more %O A382456 1,1 %A A382456 _Shyam Sunder Gupta_, Mar 27 2025