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A086102
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Concatenation of last two digits of p(n) and first two digits of p(n+1) is prime; values of such n in the sequence.
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1
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11, 23, 29, 31, 44, 45, 51, 58, 61, 66, 73, 80, 82, 84, 111, 112, 124, 127, 130, 136, 138, 167, 185, 186, 188, 192, 194, 212, 213, 215, 216, 217, 218, 275, 276, 292, 293, 294, 295, 296, 297, 299, 300, 301, 302, 319, 321, 326, 344, 345, 346, 348, 352, 353, 355
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(7)=51 because prime{51)=233, prime{52)=239 and 3323 is prime
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MATHEMATICA
| cpdQ[{a_, b_}]:=PrimeQ[FromDigits[Join[Take[IntegerDigits[a], -2], Take[ IntegerDigits[b], 2]]]]; PrimePi/@Transpose[Select[ Partition[ Prime[ Range[5, 500]], 2, 1], cpdQ]][[1]] (* From Harvey P. Dale, Mar 30 2011 *)
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CROSSREFS
| Sequence in context: A122259 A157173 A090423 * A058340 A138537 A136000
Adjacent sequences: A086099 A086100 A086101 * A086103 A086104 A086105
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KEYWORD
| easy,nonn,base
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Jul 09 2003
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EXTENSIONS
| Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Apr 27 2010
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