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A180546
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Primes that become a different prime under the mapping 4 <=> 5.
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1
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43, 53, 241, 251, 349, 359, 409, 421, 457, 463, 487, 499, 509, 521, 547, 563, 587, 599, 643, 653, 1249, 1259, 1423, 1453, 1459, 1471, 1483, 1523, 1543, 1549, 1571, 1583, 2143, 2153, 2341, 2347, 2351, 2357, 2441, 2447, 2459, 2549, 2551, 2557, 2647, 2657
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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, 4] || MemberQ[id, 5]) && PrimeQ[ FromDigits[ id /. {4 -> 5, 5 -> 4}] ]]; Select[ Prime@ Range@ 400, 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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