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A110487
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Squares of the form p*q - p - q + 2, where p and q are primes.
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1
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9, 25, 49, 81, 121, 169, 225, 289, 361, 529, 625, 841, 961, 1225, 1369, 1521, 1681, 1849, 2025, 2209, 2401, 2601, 2809, 3025, 3481, 3721, 4225, 4489, 4761, 5041, 5329, 5929, 6241, 6889, 7225, 7921, 8281, 9025, 9409, 10201, 10609, 11449, 11881, 12769
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OFFSET
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1,1
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COMMENTS
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Includes A108570 squares of lesser twin primes and A110284 squares of form 4p-3 where p is prime (q=5).
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LINKS
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MATHEMATICA
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Lim=13000; f[{p_, q_}]:=p*q-p-q+2; Union[Select[f/@Subsets[Prime[Range[PrimePi[Lim]]], {2}], #<Lim&&IntegerQ[Sqrt[#]]&]] (* James C. McMahon, Apr 20 2024 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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