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a(n)/10000000 gives sqrt(n) to 7 places.
4

%I #7 Jul 31 2022 11:29:38

%S 10000000,14142136,17320508,20000000,22360680,24494897,26457513,

%T 28284271,30000000,31622777,33166248,34641016,36055513,37416574,

%U 38729833,40000000,41231056,42426407,43588989,44721360,45825757,46904158,47958315,48989795,50000000,50990195

%N a(n)/10000000 gives sqrt(n) to 7 places.

%p lprint(round(evalf(10000000*sqrt(n))));

%o (Python)

%o from math import isqrt

%o def A027664(n): return (m:=isqrt(k:=n*10**14))+int(k-m*(m+1)>=1) # _Chai Wah Wu_, Jul 31 2022

%K nonn,base

%O 1,1

%A _N. J. A. Sloane_.