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A127746
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Smallest n-digit prime whose reversal is also prime.
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1
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2, 13, 107, 1009, 10007, 100049, 1000033, 10000169, 100000007, 1000000007, 10000000207, 100000000237, 1000000000091, 10000000000313, 100000000000261, 1000000000000273, 10000000000000079, 100000000000000049
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Smallest n-digit emirp (A006567).
Largest n-digit emirp is given by A114019.
Least emirp (A006567) greater than 10^(n-1). [Jonathan Vos Post (jvospost3(AT)gmail.com), Nov 15 2009]
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MATHEMATICA
| f[n_] := Block[{k = 10^(n - 1), id, rid}, While[ id = IntegerDigits[k]; rid = Reverse[id]; ! PrimeQ[k] || ! PrimeQ[FromDigits[rid]] || id == rid, k++ ]; k]; Table[f[n], {n, 2, 19}] (*Chandler*)
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CROSSREFS
| Cf. A006567, A031991, A114019, A114018, A127747.
Cf. A000040, A004086, A007500. [Jonathan Vos Post (jvospost3(AT)gmail.com), Nov 15 2009]
Sequence in context: A067024 A083062 A204261 * A199124 A069100 A031991
Adjacent sequences: A127743 A127744 A127745 * A127747 A127748 A127749
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KEYWORD
| nonn,base
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AUTHOR
| Lekraj Beedassy (blekraj(AT)yahoo.com), Jan 28 2007
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EXTENSIONS
| Edited and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 30 2007
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