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%I #14 Sep 01 2016 21:34:43
%S 3,6,10,23,29,36,97,108,185,199,252,310,337,404,424,446,618,631,707,
%T 833,848,905,1000,1097,1196,1253,1269,1378,1511,1552,1796,1815,2014,
%U 2060,2363,2589,2640,2692,2928,3179,3261,3554,3673,3768,3829,4370,4504,4707
%N Positions of 4 in A274640.
%H Alois P. Heinz, <a href="/A275189/b275189.txt">Table of n, a(n) for n = 1..10074</a>
%H Alois P. Heinz, <a href="/A275189/a275189.jpg">Positions of first 1410 4's in plane of A274640</a>
%F A274640(a(n))=4.
%Y Cf. A274640, A275172, A275188, A275190, A275191, A275192, A275193, A275194.
%K nonn
%O 1,1
%A _Zak Seidov_, Jul 19 2016