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Search: id:A080700
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| A080700 |
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Product of upper bound twin-prime-index-primes and their lower bound twin prime. |
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+0
1
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| 33, 85, 451, 1139, 3683, 7831, 16697, 26057, 56863, 64093, 109189, 130673, 194573, 223661, 239749, 328469, 363997, 468329, 519007, 647191, 815797, 1218871, 1301189, 1520839, 1959481, 2363057, 2648179, 2817839, 3068467, 3257437
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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Let p(i) =i-th prime, let twin(n) = (P, Q) be n-th pair of twin primes; sequence gives p(Q)*P.
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EXAMPLE
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The 3rd pair of twin primes is twin(3) = (11,13), p(13) = 41 Seq(3) = 41*11 = 451
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PROGRAM
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(PARI) twipxpindex3(n) = {sr=0; pr=1; for(x=1, n, p1=prime(x); p2=prime(x+1); if((p2-p1)==2, pr=p1*prime(prime(x+1)); sr+=1.0/pr; print1(pr" ")); ); print(); print(sr) }
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CROSSREFS
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Cf. A057470, A057473.
Sequence in context: A063838 A075039 A039833 this_sequence A080200 A067705 A075213
Adjacent sequences: A080697 A080698 A080699 this_sequence A080701 A080702 A080703
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KEYWORD
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easy,nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Mar 04 2003
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