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A104635
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Odd n such that 2*n+1 is prime.
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6
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1, 3, 5, 9, 11, 15, 21, 23, 29, 33, 35, 39, 41, 51, 53, 63, 65, 69, 75, 81, 83, 89, 95, 99, 105, 111, 113, 119, 125, 131, 135, 141, 153, 155, 165, 173, 179, 183, 189, 191, 209, 215, 219, 221, 231, 233, 239, 243, 245, 249, 251, 261, 273, 281, 285, 293, 299
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OFFSET
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1,2
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COMMENTS
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Also: Numbers k such that 2k+1 is in A002145, i.e., a Gaussian prime. - M. F. Hasler, Feb 25 2011
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LINKS
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FORMULA
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MATHEMATICA
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Select[Range[1, 301, 2], PrimeQ[2#+1]&] (* Harvey P. Dale, May 08 2012 *)
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PROG
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(PARI) forstep( k=1, 250, 2, isprime(2*k+1) && print1(k", ")) \\ M. F. Hasler, Feb 25 2011
(PARI) forprime( p=1, 500, p%4==3 || next; print1(p\2", ")) \\ M. F. Hasler, Feb 25 2011
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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STATUS
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approved
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