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A033451 Initial prime in set of 4 consecutive primes with common difference 6. 42
251, 1741, 3301, 5101, 5381, 6311, 6361, 12641, 13451, 14741, 15791, 15901, 17471, 18211, 19471, 23321, 26171, 30091, 30631, 53611, 56081, 62201, 63691, 71341, 75521, 77551, 78791, 80911, 82781, 83431, 84431, 89101, 89381, 91291, 94421 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes p such that p, p+6, p+12, p+18 are consecutive primes.

It is conjectured that there exist arbitrarily long sequences of consecutive primes in arithmetic progression. As of March 2013 the record is 10 primes.

Note that the Green and Tao reference is about arithmetic progressions that are not necessarily consecutive. - Michael B. Porter, Mar 05 2013

Subsequence of A023271. - R. J. Mathar, Nov 04 2006

REFERENCES

Ben Green and Terence Tao, "The primes contain arbitrarily long arithmetic progressions", Annals of Mathematics 167:2 (2008), 481-547.

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

Jens Kruse Andersen, The Largest Known CPAP's

Ben Green and Terence Tao, The primes contain arbitrarily long arithmetic progressions

Index entries for sequences related to primes in arithmetic progressions

EXAMPLE

251,257,263,269 are consecutive primes: 257=251+6,263=251+12,269=251+18

MATHEMATICA

A033451 = Reap[ For[p = 2, p < 100000, p = NextPrime[p], p2 = NextPrime[p]; If[p2 - p == 6, p3 = NextPrime[p2]; If[p3 - p2 == 6, p4 = NextPrime[p3]; If[p4 - p3 == 6, Sow[p]]]]]][[2, 1]] (* Jean-François Alcover, Jun 28 2012 *)

PROG

(PARI) p=2; q=3; r=5; forprime(s=7, 1e4, if(s-p==18 && s-q==12 && s-r==6, print1(p", ")); p=q; q=r; r=s) \\ Charles R Greathouse IV, Feb 14 2013

CROSSREFS

Intersection of A054800 and A023271.

Cf. A090832, A090833, A090834, A090835, A090836, A090837, A090838, A090839.

Analogous sequences [with common difference in square brackets]: A033451 [6], A033447 [12], A033448 [18], A052242 [24], A052243 [30].

Cf. A058362, A059044.

Cf. A047948 (three consecutive primes with difference 6)

Sequence in context: A215607 A099734 A054800 * A201793 A183840 A218639

Adjacent sequences:  A033448 A033449 A033450 * A033452 A033453 A033454

KEYWORD

nonn,changed

AUTHOR

Jeff Burch

STATUS

approved

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Last modified May 21 12:55 EDT 2013. Contains 225488 sequences.