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 A074766 a(n) = prime(2n) - 2*prime(n) - n. 1
 -2, -1, 0, 1, 2, 5, 2, 7, 6, 3, 6, 3, 6, 7, 4, 9, 4, 11, 10, 11, 14, 13, 10, 21, 10, 11, 18, 21, 24, 25, 8, 17, 10, 25, 16, 21, 22, 19, 24, 23, 22, 29, 18, 27, 24, 35, 22, 9, 18, 33, 40, 39, 42, 37, 32, 31, 24, 41, 34, 37, 46, 35, 24, 33, 42, 43, 28, 27, 24, 41, 44, 37, 32, 37, 30, 39, 32 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Conjecture: p(2n) - 2p(n) < 2n for all n. LINKS FORMULA a(n) = A066066(n) - n. EXAMPLE a(9) = p(18) - 2p(9) - 9 = 61 - 2*23 - 9 = 6. MAPLE A074766:=n->ithprime(2*n)-2*ithprime(n)-n: seq(A074766(n), n=1..100); # Wesley Ivan Hurt, Jan 16 2017 MATHEMATICA Table[Prime[2 n] - 2 Prime[n] - n, {n, 80}] (* Harvey P. Dale, Mar 04 2017 *) CROSSREFS Cf. A066066. Sequence in context: A277239 A138352 A129620 * A138107 A089631 A298878 Adjacent sequences:  A074763 A074764 A074765 * A074767 A074768 A074769 KEYWORD sign AUTHOR Werner D. Sand, Sep 29 2002 STATUS approved

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Last modified November 16 04:54 EST 2018. Contains 317255 sequences. (Running on oeis4.)