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A180545
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Primes that become a different prime under the mapping 3 <=> 9.
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1
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13, 19, 23, 29, 37, 53, 59, 73, 79, 83, 89, 97, 103, 109, 131, 137, 139, 173, 179, 191, 193, 197, 223, 229, 239, 263, 269, 293, 307, 311, 313, 331, 337, 347, 359, 367, 389, 397, 431, 433, 443, 449, 491, 499, 503, 509, 563, 569, 613, 619, 631, 653, 659, 691
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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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fQ[n_] := Block[{id = IntegerDigits@n}, (MemberQ[id, 3] || MemberQ[id, 9]) && PrimeQ[ FromDigits[ id /. {3 -> 9, 9 -> 3}] ]]; Select[ Prime@ Range@ 130, fQ]
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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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STATUS
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approved
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