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A053319
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Distance between the smaller members of successive twin prime pairs.
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6
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2, 6, 6, 12, 12, 18, 12, 30, 6, 30, 12, 30, 12, 6, 30, 12, 30, 12, 30, 36, 72, 12, 30, 60, 48, 30, 18, 24, 18, 150, 12, 6, 30, 24, 138, 12, 18, 12, 30, 60, 78, 48, 12, 12, 18, 108, 24, 30, 6, 120, 12, 48, 30, 24, 66, 84, 6, 54, 18, 48, 30, 54, 6, 24, 18, 12, 96, 30, 42, 30, 42
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| M. F. Hasler, Table of n, a(n) for n = 1..107406
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MATHEMATICA
| PrimeNextTwinAverage[n_]:=Module[{k}, k=n+1; While[ !PrimeQ[k-1]||!PrimeQ[k+1], k++ ]; k]; a=4; lst={}; Do[b=PrimeNextTwinAverage[a]; c=b-a; AppendTo[lst, c]; a=b, {n, 4!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), May 30 2009]
Differences[Transpose[Select[Partition[Prime[Range[450]], 2, 1], Last[#]-First[#]==2&]][[1]]] (* From Harvey P. Dale, Feb 08 2011 *)
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PROG
| (PARI) {cnt=0; lp= /*last*/ ltp=/*last twin(upper)*/ 5;
forprime(p=lp+1, default(primelimit), if(p-lp != 2, lp=p; next);
write("b053319.txt", cnt++" "p-ltp); /* print1(p-ltp", "); */ ltp=lp=p)} [M. F. Hasler, May 26 2007]
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CROSSREFS
| First differences of A001359.
Sequence in context: A087560 A071892 A064797 * A075779 A140880 A065420
Adjacent sequences: A053316 A053317 A053318 * A053320 A053321 A053322
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Mar 06 2000
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EXTENSIONS
| Definition clarified by Harvey P. Dale, Feb 08 2011
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