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Search: id:A082669
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| A082669 |
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Let p(n) = upper member of n-th pair of twin primes; sequence gives a(n) = p(n)*(p(n)-1)/2. |
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+0
2
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| 10, 21, 78, 171, 465, 903, 1830, 2628, 5253, 5886, 9591, 11325, 16290, 18528, 19701, 26106, 28920, 36585, 39903, 48828, 60726, 88410, 93528, 106953, 136503, 162735, 180300, 191271, 206403, 218130, 328455, 338253, 343206, 368511, 389403
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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This sequence also gives C(m,m-2) for all m such that m is the greater member of the n-th twin prime pair. - Christopher Tomaszewski (cmt1288(AT)comcast.net), Oct 26 2003
Let p(n) = upper member of n-th pair of twin primes; sequence gives a(n) = p(n)*(p(n)-1)/2. - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 08 2007
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MAPLE
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ZL:=[]:for p from 1 to 890 do if (isprime(p) and isprime(p+2) ) then ZL:=[op(ZL), (binomial((p+2), p))]; fi; od; print(ZL); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Mar 08 2007
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PROGRAM
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(PARI) tpcomb2(n) = { forprime(x=3, n, if(isprime(x-2), print1((x)*(x-1)/2" ") ) )
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CROSSREFS
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Sequence in context: A095192 A096564 A041196 this_sequence A146083 A001739 A072805
Adjacent sequences: A082666 A082667 A082668 this_sequence A082670 A082671 A082672
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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), May 18 2003
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