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Search: id:A062404
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| A062404 |
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Numbers n such that 2*n*prime(n)+1 is prime. |
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+0
1
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| 1, 2, 3, 6, 7, 11, 16, 21, 24, 27, 29, 30, 33, 40, 43, 49, 50, 51, 54, 59, 60, 68, 76, 78, 90, 93, 95, 103, 120, 125, 131, 134, 139, 156, 159, 162, 168, 178, 180, 188, 189, 196, 198, 214, 225, 231, 237, 241, 243, 246, 255, 259, 268, 273, 275, 277, 280, 285, 287, 288
(list; graph; listen)
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OFFSET
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1,2
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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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2*3*prime(3)+ 1= 2 * 3 * 5 + 1= 31 a prime.
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PROGRAM
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(PARI)je=[]; for(n=1, 700, if(isprime(2*n*prime(n)+1), je=concat(je, n), )); je
(PARI) { n=0; for (m=1, 10^5, if (isprime(2*m*prime(m) + 1), write("b062404.txt", n++, " ", m); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 07 2009]
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CROSSREFS
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Sequence in context: A096578 A027754 A092857 this_sequence A032875 A032842 A023773
Adjacent sequences: A062401 A062402 A062403 this_sequence A062405 A062406 A062407
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KEYWORD
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nonn
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AUTHOR
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Jason Earls (zevi_35711(AT)yahoo.com), Jul 08 2001
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EXTENSIONS
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Program corrected. - Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 07 2009
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