A340662 - OEIS

A340662

a(n) is the end of the first occurrence of n consecutive perfect powers, all of which are squares with exponents equal to 2 (A111245).

%I #5 Jan 18 2021 18:36:42

%S 4,49,196,484,1681,4900,12100,19600,32761,73984,148225,175561,328329,

%T 492804,753424,1258884,1860496,2405601,3374569,4330561,5929225,

%U 8363664,11088900,13823524,18190225,23639044,28933641,36264484,43612816,53582400,67914081,81180100,97970404

%N a(n) is the end of the first occurrence of n consecutive perfect powers, all of which are squares with exponents equal to 2 (A111245).

%F a(n) = A340664(n)^2 = A340663(n)^2 + (n - 1)*(2*A340663(n) + n - 1).

%e See A340661.

%Y Cf. A000290, A001597, A111245, A340661, A340663, A340664, A340695.

%K nonn

%O 1,1

%A _Hugo Pfoertner_, Jan 18 2021