This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A167716 #11 Mar 31 2019 14:43:21
%S A167716 1,9,49,81,289,361,1369,1681,2401,2601,2809,3249,3721,4489,5329,6561,
%T A167716 6889,7569,7921,9801,10609,14161,14641,19321,19881,21609,22201,25921,
%U A167716 32761,35721,36481,40401,41209,47089,49729,52441,61009,67081,77841
%N A167716 Squares that become a prime number when prefixed with a 1.
%C A167716 Subsequence of squares of A032664. - _Michel Marcus_, Jun 21 2016
%H A167716 G. C. Greubel, <a href="/A167716/b167716.txt">Table of n, a(n) for n = 1..10000</a>
%t A167716 Select[Range[1, 700, 2]^2, PrimeQ[FromDigits[Join[{1}, IntegerDigits[#]]]] &] (* _G. C. Greubel_, Jun 21 2016 *)
%t A167716 Select[Range[1,701,2]^2,PrimeQ[10^IntegerLength[#]+#]&] (* _Harvey P. Dale_, Mar 31 2019 *)
%Y A167716 Cf. A032664.
%K A167716 base,nonn
%O A167716 1,2
%A A167716 _Claudio Meller_, Nov 10 2009