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A030460
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Previous prime concatenated with this prime p is a prime.
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5
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3, 37, 89, 157, 163, 173, 211, 239, 257, 263, 269, 277, 337, 359, 379, 439, 479, 521, 541, 547, 607, 659, 673, 683, 733, 947, 977, 1019, 1039, 1187, 1193, 1213, 1229, 1277, 1373, 1459, 1471, 1663, 1693, 1721, 1747, 1867, 1979, 2081, 2179
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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MATHEMATICA
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Transpose[Select[Partition[Prime[Range[400]], 2, 1], PrimeQ[FromDigits[ Flatten[IntegerDigits/@#]]]&]][[2]] (* Harvey P. Dale, Dec 23 2011 *)
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PROG
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(PARI) c=0; o=2; s=1; forprime(p=3, default(primelimit), p>s & s*=10; isprime(o*s+o=p) & write("b030460.txt", c++, " ", p)) \\ M. F. Hasler, Feb 06 2011
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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