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 A074884 For a prime p, let k(p) be the least k such that 2kp+1 is prime. Sequence gives primes for which k(p) exceeds k(q) for all primes q < p. 2
 2, 7, 17, 19, 59, 167, 197, 227, 317, 457, 521, 1637, 1861, 1997, 2053, 3833, 5227, 19891, 47303, 54973, 58603, 124567, 138163, 170167, 707467, 1637429, 1940777, 3717731, 4722079, 17886697, 27507569, 73342163, 154205101, 160561133, 186668543, 429364379, 458121431, 1459411661 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS EXAMPLE a(1)=2 because k(2)=1 (2*1*2+1=5 is prime); a(2)=7 because k(7)=2 (2*1*7+1=15 is not prime, 2*2*7+1=29 is prime) CROSSREFS Cf. A117673. Sequence in context: A045378 A101568 A182575 * A105911 A038873 A141131 Adjacent sequences:  A074881 A074882 A074883 * A074885 A074886 A074887 KEYWORD nonn AUTHOR Mike Oakes (mikeoakes2(AT)aol.com), Oct 01 2002 EXTENSIONS a(30)-a(38) from Don Reble, Jan 07 2013 STATUS approved

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