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 A180552 Primes that become a different prime under the mapping 5 <=> 7. 0
 5, 7, 53, 59, 73, 79, 251, 271, 353, 359, 373, 379, 509, 569, 571, 653, 673, 709, 751, 769, 1151, 1171, 1259, 1279, 1451, 1471, 1523, 1579, 1583, 1723, 1759, 1783, 2351, 2371, 2531, 2549, 2591, 2731, 2749, 2791, 3251, 3271, 3533, 3539, 3559, 3593, 3733 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Index to Primes, Primes that become a different prime under some mapping. MATHEMATICA fQ[n_] := Block[{id = IntegerDigits@n}, (MemberQ[id, 5] || MemberQ[id, 7]) && PrimeQ[ FromDigits[ id /. {5 -> 7, 7 -> 5}] ]]; Select[ Prime@ Range@ 550, fQ] CROSSREFS Cf. A171039, A175791, A180517 thru A180559, A175789, A180560, A180561. Sequence in context: A110420 A210244 A123789 * A168545 A082714 A106112 Adjacent sequences:  A180549 A180550 A180551 * A180553 A180554 A180555 KEYWORD base,nonn AUTHOR Zak Seidov and Robert G. Wilson v, Sep 09 2010 STATUS approved

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