A034995 Smallest square starting with a string of n 9's.

9, 99225, 9991921, 999950884, 99999515529, 9999995824729, 999999961946176, 99999999356895225, 99999999989350756, 999999999956753113201, 99999999999470044512256, 9999999999991276338467889

Offset: 1

Author

Patrick De Geest, Nov 15 1998

Keywords

• nonn
• base

Links

• Robert Israel, Table of n, a(n) for n = 1..499

Crossrefs

Cf. A034994.

Programs

Maple

f:= proc(n) local d,q,x;
  for d from n do
     q:= 10^d-10^(d-n);
     x:= isqrt(q);
     if x^2 < q then x:= x+1 fi;
     if x^2 < 10^d then return x^2 fi
  od
end proc:
map(f, [$1..20]); # Robert Israel, Sep 28 2018

Extensions

More terms from Hans Havermann, Jun 18 2001