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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.

A303595 Index of n-th prime in A294994, or -1 if that prime is missing.

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%I A303595 #9 May 28 2018 23:11:17
%S A303595 1,2,3,4,5,6,8,9,10,7,11,13,14,15,12,18,16,17,21,20,22,23,42,43,25,19,
%T A303595 24,26,27,44,28,31,32,33,38,30,37,34,35,36,40,39,29,46,47,48,41,49,51,
%U A303595 52,53,50,45,54,59,58,60,57,61,62,56,66,64,65,63,67,71,69,70,68,74,73
%N A303595 Index of n-th prime in A294994, or -1 if that prime is missing.
%C A303595 Conjectured to be a permutation of the natural numbers.
%H A303595 N. J. A. Sloane, <a href="/A303595/b303595.txt">Table of n, a(n) for n = 1..5000</a>
%Y A303595 Cf. A294994.
%K A303595 nonn
%O A303595 1,2
%A A303595 _N. J. A. Sloane_, May 28 2018