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 A174744 #10 Sep 08 2022 08:45:51
%S A174744 9,49,961,16129,4190209,67092481,17179607041,274876858369,
%T A174744 70368727400449,288230375077969921,4611686014132420609,
%U A174744 18889465931203702947841,4835703278454118652313601,77371252455318674995150849,19807040628565802923409276929
%N A174744 (2^p-1)^2 where p is prime.
%e A174744 For p=2, (2^2-1)^2=9; for p=3, (2^3-1)^2=49; for p=5, (2^5-1)^2=961.
%t A174744 Table[(2^Prime[n] - 1)^2, {n, 20}] (* _Vincenzo Librandi_, May 01 2015 *)
%o A174744 (Magma) [(2^p-1)^2: p in [0..1000] |IsPrime(p)];
%Y A174744 Cf. A133049.
%K A174744 nonn
%O A174744 1,1
%A A174744 _Vincenzo Librandi_, Apr 11 2010
%E A174744 Definition clarified by _Jon E. Schoenfield_, Jun 18 2010
%E A174744 More terms from _Vincenzo Librandi_, May 01 2015