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A167736
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Primes that becomes a square when prefixed with a 3.
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8
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61, 4969, 6481, 9601, 23761, 26041, 37561, 68449, 88129, 129361, 179089, 214849, 265249, 301489, 308761, 411409, 455881, 463321, 485689, 508129, 523129, 530641, 659569, 713329, 751969, 829849, 916441, 924361, 948169, 964081, 996001, 1058329, 1147561, 1281649
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[Prime[Range[1000000]], IntegerQ[Sqrt[FromDigits[Join[{3}, IntegerDigits[ #]]]]]&] (* Harvey P. Dale, Nov 01 2011 *)
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PROG
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(PARI)
\\ terms upto 10^n
upto(n) = {my(sqrt31 = sqrt(3.1), sqrt40 = sqrt(4.0), r); for(k=2, n, for(j = ceil((sqrt31 * sqrt(10^k))), floor(sqrt40 * sqrt(10^k)), r = j^2%10^k; if(isprime(r), print1(r", "))))} \\ David A. Corneth, Jun 24 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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