%I
%S 1,2,7,8,10,19,21,22,25,27,31,32,34,37,38,39,46,47,48,51,58,60,61,62,
%T 69,72,73,77,80,81,82,85,88,90,97,99,100,101,102,104,109,111,115,117,
%U 120,122,127,128,131,134,136,138,139,140,144,146,149,151,153,160
%N Index of the first element of row n of A226607.
%H Geoffrey H. Morley, <a href="/A226612/b226612.txt">Table of n, a(n) for n = 1..6667</a>
%Y a(n) is also the index of the first element of row n in A226608 to A226611.
%Y Cf. A226613, A226628.
%K nonn
%O 1,2
%A _Geoffrey H. Morley_, Jun 13 2013
