|
Search: id:A075240
|
|
|
| A075240 |
|
Smallest prime whose base n reversal is not a prime. |
|
+0
1
|
|
| 2, 3, 11, 5, 13, 7, 11, 29, 19, 11, 19, 13, 29, 23, 19, 17, 23, 19, 31, 29, 29, 23, 29, 37, 37, 29, 31, 29, 43, 31, 37, 37, 59, 59, 43, 37, 41, 59, 43, 41, 59, 43, 47, 47, 53, 47, 59, 61, 59, 61, 59, 53, 67, 59, 59, 59, 61, 59, 73, 61, 71, 67, 79, 71, 89, 67, 71, 101, 89
(list; graph; listen)
|
|
|
OFFSET
|
2,1
|
|
|
COMMENT
|
All primes show up in the sequence eventually.
|
|
EXAMPLE
|
a(4) = 11 because 11 (2) = 13 and 11 (3) = 19 but 11 (4) = 14.
|
|
MATHEMATICA
|
a = {}; Do[k = 1; While[ PrimeQ[ FromDigits[ Reverse[ IntegerDigits[ Prime[k], n]], n]], k++ ]; a = Append[a, Prime[k]], {n, 2, 70}]; a
|
|
CROSSREFS
|
Sequence in context: A084743 A030391 A039654 this_sequence A137332 A084047 A145077
Adjacent sequences: A075237 A075238 A075239 this_sequence A075241 A075242 A075243
|
|
KEYWORD
|
base,easy,nonn
|
|
AUTHOR
|
Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 09 2002
|
|
|
Search completed in 0.002 seconds
|
