A174744 (2^p-1)^2 where p is prime.
9, 49, 961, 16129, 4190209, 67092481, 17179607041, 274876858369, 70368727400449, 288230375077969921, 4611686014132420609, 18889465931203702947841, 4835703278454118652313601, 77371252455318674995150849, 19807040628565802923409276929
Offset: 1
Keywords
Examples
For p=2, (2^2-1)^2=9; for p=3, (2^3-1)^2=49; for p=5, (2^5-1)^2=961.
Crossrefs
Cf. A133049.
Programs
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Magma
[(2^p-1)^2: p in [0..1000] |IsPrime(p)];
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Mathematica
Table[(2^Prime[n] - 1)^2, {n, 20}] (* Vincenzo Librandi, May 01 2015 *)
Extensions
Definition clarified by Jon E. Schoenfield, Jun 18 2010
More terms from Vincenzo Librandi, May 01 2015