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%I #10 Sep 01 2016 21:39:57
%S 26,31,37,43,56,68,81,96,107,127,144,162,208,247,304,358,363,509,579,
%T 894,1048,1080,1115,1398,1590,1630,1671,1731,1882,1925,2151,2198,2245,
%U 2612,2743,2768,2849,2902,2927,3011,3320,3436,3493,3645,3706,4017,4341,4572
%N Positions of 7 in A274640.
%H Alois P. Heinz, <a href="/A275192/b275192.txt">Table of n, a(n) for n = 1..10073</a>
%H Alois P. Heinz, <a href="/A275192/a275192.jpg">Positions of first 1411 7's in plane of A274640</a>
%F A274640(a(n)) = 7.
%Y Cf. A274640, A275172, A275188, A275189, A275190, A275191, A275193, A275194.
%K nonn
%O 1,1
%A _Zak Seidov_, Jul 19 2016