|
Search: id:A127746
|
|
|
| A127746 |
|
Smallest n-digit prime whose reversal is also prime. |
|
+0
2
|
|
| 2, 13, 107, 1009, 10007, 100049, 1000033, 10000169, 100000007, 1000000007, 10000000207, 100000000237, 1000000000091, 10000000000313, 100000000000261, 1000000000000273, 10000000000000079, 100000000000000049
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
Smallest n-digit emirp (A006567).
Largest n-digit emirp is given by A114019.
|
|
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*)
|
|
CROSSREFS
|
Cf. A006567, A031991, A114019, A114018, A127747.
Sequence in context: A067024 A103513 A083062 this_sequence A069100 A031991 A052444
Adjacent sequences: A127743 A127744 A127745 this_sequence A127747 A127748 A127749
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Lekraj Beedassy (blekraj(AT)yahoo.com), Jan 28 2007
|
|
EXTENSIONS
|
Edited and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Jan 30 2007
|
|
|
Search completed in 0.002 seconds
|
