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A180525
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Primes that become a different prime under the mapping 1 <=> 2.
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1
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13, 19, 23, 29, 113, 139, 157, 163, 193, 223, 239, 257, 263, 293, 919, 929, 1019, 1039, 1063, 1069, 1087, 1103, 1123, 1187, 1193, 1223, 1237, 1279, 1399, 1427, 1447, 1459, 1543, 1549, 1579, 1609, 1627, 1657, 1663, 1693, 1699, 1723, 1753, 1777, 1789, 1879
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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, 1] || MemberQ[id, 2]) && PrimeQ[ FromDigits[ id /. {1 -> 2, 2 -> 1}] ]]; Select[ Prime@ Range@ 300, 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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