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 A357988 #12 Oct 23 2022 13:42:51 %S A357988 1,2,4,3,8,12,9,16,15,21,26,24,30,34,43,40,45,47,53,67,59,64,70,74,84, %T A357988 94,89,96,93,107,110,112,120,128,124,134,137,148,156,150,163,161,170, %U A357988 174,180,186,189,208,201,209,213,207,222,219,240,244,245,247,250 %N A357988 a(n) is the unique k such that A357579(k) = prime(n) (the n-th prime number), or -1 if no such k exists. %H A357988 Rémy Sigrist, <a href="/A357988/b357988.txt">Table of n, a(n) for n = 1..5000</a> %H A357988 Rémy Sigrist, <a href="/A357988/a357988.txt">C program</a> %H A357988 Rémy Sigrist, <a href="/A357988/a357988.gp.txt">PARI program</a> %F A357988 a(n) = A357986(prime(n)). %e A357988 A357579(53) = 67 = prime(19), so a(19) = 53. %o A357988 (C) See Links section. %o A357988 (PARI) See Links section. %Y A357988 Cf. A357579, A357986. %K A357988 nonn %O A357988 1,2 %A A357988 _Rémy Sigrist_, Oct 23 2022