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%I #5 Dec 04 2022 08:34:12
%S 1,0,0,2,0,0,4,0,3,8,0,0,7,0,0,13,0,24,17,0,0,43,0,0,67,0,63,134,0,0,
%T 83,0,0,167,0,264,314,0,0,313,0,0,707,0,1374,836,0,0,1667,0,0,2236,0,
%U 3114,4472,0,0,6833,0,0,8167,0,8937,16667,0,0,21886,0,0,29614
%N a(n) is the least k > 0 such that the sum of the decimal digits of k^2 is n, or 0 if no such k exists.
%Y The nonzero terms are A067179.
%Y Cf. A056991, A231897 (similar for binary weight).
%K nonn,base
%O 1,4
%A _Hugo Pfoertner_, Dec 04 2022