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%I #23 Sep 04 2021 21:08:23
%S 1,2,3,4,5,6,7,10,11,12,13,14,16,19,20,21,22,23,24,25,28,29,30,31,32,
%T 33,34,37,38,39,40,41,42,43,46,47,48,49,50,51,52,55,57,58,59,60,61,64,
%U 65,66,67,68,69,70,73,74,75,76,77,78,79,82,83,84,85,86,87
%N Numbers k such that A000422(k) is squarefree.
%H Patrick De Geest, <a href="http://www.worldofnumbers.com/revfact.htm">Reversed Smarandache Concatenated Numbers, Prime factors from n down to 1</a>
%H M. Fleuren, <a href="http://www.gallup.unm.edu/~smarandache/michafleuren.htm">Factors and primes of Smarandache sequences</a>.
%H M. Fleuren, <a href="http://www.gallup.unm.edu/~smarandache/micha.txt">Smarandache Factors and Reverse factors</a>
%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_008.htm">Puzzle 8. Primes by Listing</a>, The Prime Puzzles & Problems Connection.
%Y Cf. A000422, A048288, A048342, A050675, A050688.
%K nonn,base,hard
%O 1,2
%A _Patrick De Geest_, Aug 15 1999
%E More terms from and name clarified by _Sean A. Irvine_, Aug 17 2021
%E Offset changed to 1 by _Jinyuan Wang_, Sep 04 2021
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