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 A353719 #15 May 11 2022 00:20:48 %S A353719 2,5,13,53,56,34,9,69,86,185,245,50,102,105,549,83,692,1209,114,329, %T A353719 99,1007,189,235,47,319,542,740,724,232,5257,59,159,373,480,1100,1371, %U A353719 476,1141,1138,1044,498,18890,156,363,867,929,7890,1041,925,564,12929,682 %N A353719 Index of prime(n) in A353709, or -1 if prime(n) does not appear in A353709. %C A353719 Prime(n) refers to the n-th term in the sequence of primes, not the n-th prime in A353709. %H A353719 Rémy Sigrist, <a href="/A353719/b353719.txt">Table of n, a(n) for n = 1..8192</a> %H A353719 Rémy Sigrist, <a href="/A353719/a353719.txt">C++ program</a> %e A353719 A353709 has offset 0 and begins 0, 1, 2, 4, 8, 3, 16, 12, 32, 17, 6, 40, 64, 5, 10, ..., so a(1) = 2 (from A353709(2) = 2), and a(7) = 9 (from A353709(9) = 17 = prime(7)). %o A353719 (C++) See Links section. %Y A353719 Cf. A353709, A353717. %K A353719 nonn,base %O A353719 1,1 %A A353719 _N. J. A. Sloane_, May 09 2022 %E A353719 More terms from _Rémy Sigrist_, May 09 2022