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 A350621 #21 Jan 28 2022 16:38:10 %S A350621 7,2,71,25,30,345,161,148,51,34,48,63,234,40,126,73,135,192,454,97,78, %T A350621 24841,433,85,17282073747557,322,102,106544217,207,556 %N A350621 a(n) is the smallest k such that A350877(k) = prime(n), or -1 if prime(n) does not appear in A350877. %C A350621 Based on the data in A350620. %Y A350621 Cf. A350877, A350618, A350620. %K A350621 nonn,more %O A350621 1,1 %A A350621 _N. J. A. Sloane_, Jan 23 2022 %E A350621 a(25)-a(30) from _Martin Ehrenstein_, Jan 26 2022