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Numbers whose square has initial digit '7'.
2

%I #23 Aug 09 2021 04:57:59

%S 27,28,84,85,86,87,88,89,265,266,267,268,269,270,271,272,273,274,275,

%T 276,277,278,279,280,281,282,837,838,839,840,841,842,843,844,845,846,

%U 847,848,849,850,851,852,853,854,855,856,857,858,859,860,861,862,863

%N Numbers whose square has initial digit '7'.

%H Seiichi Manyama, <a href="/A045861/b045861.txt">Table of n, a(n) for n = 1..10000</a>

%t Flatten[Table[Range[Ceiling[Sqrt[7 10^i]],Floor[Sqrt[8 10^i-1]]],{i,2,5}]] (* _Harvey P. Dale_, Mar 06 2011 *)

%Y Cf. A045791.

%K nonn,base

%O 1,1

%A _Jeff Burch_