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 A167739 #18 Sep 04 2025 21:23:44
%S A167739 241,1009,3001,44809,67489,93889,145441,195121,205081,235009,285049,
%T A167739 295081,355441,416089,538249,558721,620329,713281,744409,817321,
%U A167739 1199329,1418569,1481281,1889689,1952641,2520649,2742241,3409369,3504961,3568729,3792169,3952009
%N A167739 Primes that become squares when prefixed with a 6.
%H A167739 Alois P. Heinz, <a href="/A167739/b167739.txt">Table of n, a(n) for n = 1..20000</a> (first 105 terms from Vincenzo Librandi)
%t A167739 Select[Prime[Range[300000]],IntegerQ[Sqrt[FromDigits[Join[{6}, IntegerDigits[ #]]]]]&] (* _Harvey P. Dale_, May 05 2012 *)
%Y A167739 Cf. A167734, A167735, A167736, A167737, A167738, A167740, A167741.
%K A167739 base,nonn,changed
%O A167739 1,1
%A A167739 _Claudio Meller_, Nov 10 2009
%E A167739 More terms from _Harvey P. Dale_, May 05 2012