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A078852 Initial term in sequence of four consecutive primes separated by 3 consecutive differences each <=6 (i.e., when d=2,4 or 6) and forming d-pattern=[4, 6,6]; short d-string notation of pattern = [466]. 15
43, 163, 643, 937, 967, 1093, 1213, 2953, 4003, 4447, 6967, 7573, 8737, 9463, 10243, 10597, 11923, 12487, 12637, 13033, 14533, 14737, 15787, 16087, 16417, 16477, 16927, 17317, 17467, 20113, 22063, 25453, 26683, 26713, 27763, 29863, 32983 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Subsequence of A078561. - R. J. Mathar, Feb 11 2013

LINKS

R. J. Mathar, Table of n, a(n) for n = 1..1000

FORMULA

Primes p = p(i) such that p(i+1)=p+4, p(i+2)=p+4+6, p(i+3)=p+4+6+6.

EXAMPLE

p=43,43+4=47,43+4+6=53,43+4+6+6=59 are consecutive primes.

MATHEMATICA

Transpose[Select[Partition[Prime[Range[4000]], 4, 1], Differences[#]=={4, 6, 6}&]][[1]] (* Harvey P. Dale, Dec 15 2015 *)

PROG

(PARI) isok(n) = isprime(n) && (nextprime(n+1) == (n+4)) && (nextprime(n+5) == (n+10)) && (nextprime(n+11) == (n+16)) \\ Michel Marcus, Jul 23 2013

CROSSREFS

Cf. analogous prime quadruple sequences with various possible {2, 4, 6}-difference-patterns in brackets: A007530[242], A078847[246], A078848[264], A078849[266], A052378[424], A078850[426], A078851[462], A078852[466], A078853[624], A078854[626], A078855[642], A078856[646], A078857[662], A078858[664], A033451[666].

Sequence in context: A142691 A200845 A235392 * A078956 A206399 A123040

Adjacent sequences:  A078849 A078850 A078851 * A078853 A078854 A078855

KEYWORD

nonn

AUTHOR

Labos Elemer, Dec 11 2002

EXTENSIONS

Listed terms verified by Ray Chandler, Apr 20 2009

STATUS

approved

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Last modified February 17 20:06 EST 2018. Contains 299296 sequences. (Running on oeis4.)