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A180527
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Primes that become a different prime under the mapping 1 <=> 4.
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1
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13, 17, 43, 47, 109, 113, 139, 149, 157, 163, 167, 179, 199, 317, 347, 409, 419, 439, 443, 457, 463, 467, 479, 499, 613, 617, 643, 647, 1019, 1049, 1093, 1109, 1117, 1123, 1163, 1193, 1213, 1229, 1249, 1259, 1283, 1289, 1297, 1319, 1327, 1373, 1427, 1429
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listen;
history;
text;
internal format)
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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, 4]) && PrimeQ[ FromDigits[ id /. {1 -> 4, 4 -> 1}] ]]; Select[ Prime@ Range@ 250, 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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