|
Search: id:A069706
|
|
|
| A069706 |
|
Primes with property that swapping first and last digits also gives a prime. |
|
+0
3
|
|
| 2, 3, 5, 7, 11, 13, 17, 31, 37, 71, 73, 79, 97, 101, 107, 113, 131, 149, 151, 157, 167, 179, 181, 191, 199, 311, 313, 337, 347, 353, 359, 373, 383, 389, 701, 709, 727, 733, 739, 743, 751, 757, 761, 769, 787, 797, 907, 919, 929, 937, 941, 953, 967, 971, 983
(list; graph; listen)
|
|
|
OFFSET
|
1,1
|
|
|
COMMENT
|
This is not the same as A007500, "palindromic" primes.
|
|
EXAMPLE
|
1049 and 9041 both are primes hence both are members.
|
|
MATHEMATICA
|
Do[t = IntegerDigits[ Prime[n]]; u = t; u[[1]] = t[[ -1]]; u[[ -1]] = t[[1]]; t = FromDigits[u]; If[ PrimeQ[t], Print[ Prime[n]]], {n, 1, 300}]
|
|
CROSSREFS
|
Cf. A007500, A069707, A069708.
Sequence in context: A086498 A055387 A061461 this_sequence A007500 A090933 A107845
Adjacent sequences: A069703 A069704 A069705 this_sequence A069707 A069708 A069709
|
|
KEYWORD
|
nonn,base
|
|
AUTHOR
|
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 08 2002
|
|
EXTENSIONS
|
Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 12 2002
Edited by N. J. A. Sloane (njas(AT)research.att.com), Jan 20 2009
|
|
|
Search completed in 0.005 seconds
|
