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Search: id:A061783
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| A061783 |
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Primes p such that p + (p reversed) is also a prime. |
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+0
1
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| 229, 239, 241, 257, 269, 271, 277, 281, 439, 443, 463, 467, 479, 499, 613, 641, 653, 661, 673, 677, 683, 691, 811, 823, 839, 863, 881, 20011, 20029, 20047, 20051, 20101, 20161, 20201, 20249, 20269, 20347, 20389, 20399, 20441, 20477, 20479, 20507
(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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229 is a term since 229 is a prime and so is 229 + 922 = 1151.
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PROGRAM
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(PARI) { n=0; forprime (p=2, 86843, x=p; r=0; while (x>0, d=x-10*(x\10); x\=10; r=r*10 + d); if (isprime(p + r), write("b061783.txt", n++, " ", p)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Jul 28 2009]
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CROSSREFS
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Sequence in context: A091551 A033528 A086002 this_sequence A140017 A119711 A062589
Adjacent sequences: A061780 A061781 A061782 this_sequence A061784 A061785 A061786
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KEYWORD
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nonn,base,easy
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 24 2001
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EXTENSIONS
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Corrected and extended by Patrick De Geest (pdg(AT)worldofnumbers.com), May 26 2001
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