This site is supported by donations to The OEIS Foundation.

 Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A113274 Record gaps between twin primes. 15
 2, 6, 12, 18, 30, 36, 72, 150, 168, 210, 282, 372, 498, 630, 924, 930, 1008, 1452, 1512, 1530, 1722, 1902, 2190, 2256, 2832, 2868, 3012, 3102, 3180, 3480, 3804, 4770, 5292, 6030, 6282, 6474, 6552, 6648, 7050, 7980, 8040, 8994, 9312, 9318, 10200, 10338, 10668, 10710, 11388, 11982, 12138, 12288, 12630, 13050, 14262, 14436, 14952, 15396, 15720, 16362, 16422, 16590, 16896, 17082, 18384, 19746, 19992, 20532, 21930, 22548, 23358, 23382, 25230, 26268, 28842 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(n) mod 6 = 0 for each n>1. REFERENCES Hardy, G. H. and Littlewood, J. E. "Some Problems of 'Partitio Numerorum.' III. On the Expression of a Number as a Sum of Primes." Acta Math. 44, 1-70, 1923. LINKS Richard Fischer, Maximale Lücken (Intervallen) von Primzahlenzwillingen Alexei Kourbatov, Maximal gaps between prime k-tuples A. Kourbatov, Maximal gaps between prime k-tuples: a statistical approach, arXiv preprint arXiv:1301.2242, 2013 .and J. Int. Seq. 16 (2013) #13.5.2 Alexei Kourbatov, Tables of record gaps between prime constellations, arXiv preprint arXiv:1309.4053, 2013. Alexei Kourbatov, The distribution of maximal prime gaps in Cramer's probabilistic model of primes, arXiv preprint arXiv:1401.6959, 2014 Tomás Oliveira e Silva, Gaps between twin primes Luis Rodriguez and Carlos Rivera, Gaps between consecutive twin pairs Eric W. Weisstein, k-Tuple Conjecture Eric W. Weisstein, Twin Prime Constant FORMULA a(n) = A036063(n) + 2. a(n) = A036062(n) - A113275(n). From Alexei Kourbatov, Dec 29 2011: (Start) (1) Upper bound: gaps between twin primes are smaller than 0.76*(log p)^3, where p is the prime at the end of the gap. (2) Estimate for the actual size of the maximal gap that ends at p: maximal gap = a(log(p/a)-1.2), where a = 0.76*(log p)^2 is the average gap between twin primes near p, as predicted by the Hardy-Littlewood k-tuple conjecture. Formulas (1) and (2) are asymptotically equal as p tends to infinity. However, (1) yields values greater than all known gaps, while (2) yields "good guesses" that may be either above or below the actual size of known maximal gaps. Both formulas (1) and (2) are derived from the Hardy-Littlewood k-tuple conjecture via probability-based heuristics relating the expected maximal gap size to the average gap. Neither of the formulas has a rigorous proof (the k-tuple conjecture itself has no formal proof either). In both formulas, the constant ~0.76 is reciprocal to the twin prime constant 1.32032... (End) EXAMPLE The first twin primes are 3,5 and 5,7 so a(0)=5-3=2. The following pair is 11,13 so a(1)=11-5=6. The following pair is 17,19 so 6 remains the record and no terms are added. MATHEMATICA NextLowerTwinPrim[n_] := Block[{k = n + 6}, While[ !PrimeQ[k] || !PrimeQ[k + 2], k+=6]; k]; p = 5; r = 2; t = {2}; Do[ q = NextLowerTwinPrim[p]; If[q > r + p, AppendTo[t, q - p]; Print[{p, q - p}]; r = q - p]; p = q, {n, 10^9}]; t (* Robert G. Wilson v *) CROSSREFS The smallest primes originating the sequence are given in A113275. Cf. A008407, A005250, A002386. Sequence in context: A159793 A238739 A006511 * A181660 A036913 A317089 Adjacent sequences:  A113271 A113272 A113273 * A113275 A113276 A113277 KEYWORD nonn AUTHOR Bernardo Boncompagni, Oct 21 2005 EXTENSIONS More terms from Robert G. Wilson v, Oct 22 2005 Corrected terms based on A036063, cross-checked with independent computations by Carlos Rivera and Richard Fischer (linked). Terms up to a(72) are given in Kourbatov (2013), terms up to a(75) in Oliveira e Silva website. STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 18 18:07 EST 2018. Contains 318243 sequences. (Running on oeis4.)