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A063910
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Numbers n such that n and 2n-7 are primes.
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4
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5, 7, 13, 19, 37, 43, 67, 73, 79, 103, 109, 139, 157, 193, 223, 277, 307, 313, 349, 367, 373, 379, 397, 409, 433, 457, 463, 487, 499, 523, 547, 619, 643, 727, 733, 739, 769, 787, 853, 877, 883, 919, 937, 997, 1009, 1069, 1093, 1123, 1129, 1237
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,1000
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PROG
| (PARI) { n=0; p=1; for (m=1, 10^9, p=nextprime(p+1); if (isprime(2*p - 7), write("b063910.txt", n++, " ", p); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Sep 02 2009]
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CROSSREFS
| Sequence in context: A074304 A072677 A117249 * A189557 A045444 A129782
Adjacent sequences: A063907 A063908 A063909 * A063911 A063912 A063913
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Aug 31 2001
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