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A156121
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First prime of a pair, formed by concatenating n, n+1, the second prime (not shown) formed by concatenating n+2, n+3.
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2
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67, 7879, 9091, 186187, 276277, 426427, 438439, 450451, 600601, 606607, 798799, 816817, 858859, 936937, 960961, 11401141, 13981399, 15361537, 17461747, 17881789, 18961897, 21002101, 21902191, 22082209, 27362737, 28802881
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OFFSET
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1,1
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LINKS
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EXAMPLE
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For n=6 the primes generated are 67 and 89 so 67 is in the sequence.
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MATHEMATICA
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fd[lst_]:=FromDigits[Flatten[IntegerDigits/@lst]]; ppcQ[n_]:=And@@ PrimeQ[ {fd[{n, n+1}], fd[{n+2, n+3}]}]; fd[{#, #+1}]&/@Select[Range[10000], ppcQ] (* Harvey P. Dale, Aug 07 2013 *)
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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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