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Search: id:A069706
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| A069706 |
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Primes which give another prime when the most significant and the least significant digits are swapped. |
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+0
3
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| 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)
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OFFSET
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1,1
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COMMENT
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This is not the same as A007500, "palindromic" primes.
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EXAMPLE
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1049 and 9041 both are primes hence both are members.
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MATHEMATICA
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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}]
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CROSSREFS
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Cf. A007500, A069707, A069708.
Sequence in context: A055387 A061461 A007500 this_sequence A090933 A107845 A090934
Adjacent sequences: A069703 A069704 A069705 this_sequence A069707 A069708 A069709
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KEYWORD
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nonn,base
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 08 2002
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 12 2002
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