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%I #35 Jan 02 2023 12:30:51
%S 2,1,4,2,4,3,4,3,5,5,6,7,6,7,11,11,6,11,8,11,11,13,8,13,17,17,17,17,9,
%T 19,9,19,19,23,23,23,10,23,29,29,12,29,12,29,29,29,12,29,31,31,37,37,
%U 14,37,37,37,37,37,14,41,15,41,41,41,41,43,15,43,47,47
%N Column k=1 of A261297.
%H Alois P. Heinz, <a href="/A261211/b261211.txt">Table of n, a(n) for n = 1..10000</a>
%H E. Angelini, <a href="http://list.seqfan.eu/oldermail/seqfan/2015-September/015293.html">Vertices, edges, primes and non-primes</a>, SeqFan list, Sept. 16, 2015.
%Y Cf. A261297.
%K nonn
%O 1,1
%A _Alois P. Heinz_, Sep 21 2015
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