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A167737
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Primes that becomes a square when prefixed with a 4.
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8
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41, 761, 23801, 31649, 39569, 63761, 1100921, 1951529, 2497361, 2810849, 3046721, 3678881, 4715969, 4796249, 5118089, 5198729, 5441081, 5846441, 5927729, 6009089, 6498761, 6662561, 6908801, 7238129, 7983329, 8149721, 8483369, 8734361, 9744809, 9829481
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OFFSET
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1,1
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LINKS
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MAPLE
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map(t -> t - 4*10^ilog10(t), select(t -> isprime(t - 4*10^ilog10(t)), [seq(seq(i^2, i=ceil(sqrt(4.1*10^d)) .. floor(sqrt(5*10^d))), d=1..10)])); # Robert Israel, Nov 08 2023
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MATHEMATICA
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Select[Prime[Range[10^4]], IntegerQ[Sqrt[FromDigits[Join[{4}, IntegerDigits[#]]]]]&] (* G. C. Greubel, Jun 23 2016 *)
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CROSSREFS
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KEYWORD
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base,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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