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Search: id:A061365
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| A061365 |
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Numbers n such that either n or its reversal (but not both) is prime. |
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+0
1
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| 14, 16, 19, 20, 23, 29, 30, 32, 34, 35, 38, 41, 43, 47, 50, 53, 59, 61, 67, 70, 74, 76, 83, 89, 91, 92, 95, 98, 103, 104, 106, 109, 110, 112, 118, 119, 124, 125, 127, 128, 130, 133, 134, 136, 137, 139, 140, 142, 145, 146, 152, 160, 163, 164, 166
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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EXAMPLE
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14=2*7 is a term as 41 is prime but 14 is not; 13 is not a term as its reversal is also a prime.
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MATHEMATICA
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Select[ Range[169], Xor[ PrimeQ[ # ], PrimeQ[ FromDigits[ Reverse[ IntegerDigits[ # ]]]]] & ]
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PROGRAM
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(PARI) { n=0; for (m=0, 3910, x=m; r=0; while (x>0, d=x-10*(x\10); x\=10; r=r*10 + d); if ((isprime(m) + isprime(r)) == 1, write("b061365.txt", n++, " ", m)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 21 2009]
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CROSSREFS
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Sequence in context: A053425 A034305 A091898 this_sequence A102107 A007935 A076055
Adjacent sequences: A061362 A061363 A061364 this_sequence A061366 A061367 A061368
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KEYWORD
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nonn,base
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AUTHOR
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Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 21 2002
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