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 A383290 #6 May 01 2025 16:22:53 %S A383290 1,7,35,200,1465,11144,91323,812371,7408754,67982202,621496655 %N A383290 Number of happy primes <= 10^n. %C A383290 The proportion of happy primes to total primes seems to follow the same pattern as the proportion of happy numbers to total numbers, at least up to 10^10. %H A383290 Shyam Sunder Gupta, <a href="https://doi.org/10.1007/978-981-97-2465-9_7">Happy Numbers</a>, Exploring the Beauty of Fascinating Numbers, Springer (2025) Ch. 7, 209-222. %Y A383290 Cf. A007770, A035497, A068571. %K A383290 nonn,base,more %O A383290 1,2 %A A383290 _Shyam Sunder Gupta_, Apr 22 2025 %E A383290 a(11) from _Amiram Eldar_, Apr 23 2025