login
This site is supported by donations to The OEIS Foundation.

 

Logo

The OEIS Foundation is grateful to everyone who made a donation during our Annual Appeal.     Visit the new and spectacular Pictures from the OEIS page!

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A022009 Initial members of prime septuplets (p, p+2, p+6, p+8, p+12, p+18, p+20). 33
11, 165701, 1068701, 11900501, 15760091, 18504371, 21036131, 25658441, 39431921, 45002591, 67816361, 86818211, 93625991, 124716071, 136261241, 140117051, 154635191, 162189101, 182403491, 186484211, 187029371, 190514321, 198453371 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are congruent to 11 (modulo 210). - Matt C. Anderson, May 26 2015

LINKS

Matt C. Anderson and Dana Jacobsen, Table of n, a(n) for n = 1..10000 [first 1000 terms from Matt C. Anderson]

T. Forbes, Prime k-tuplets

Matt C. Anderson, table of prime k-tuplets.

Eric W. Weisstein, Prime Constellation (MathWorld)

MATHEMATICA

Transpose[Select[Partition[Prime[Range[10400000]], 7, 1], Differences[#] == {2, 4, 2, 4, 6, 2}&]][[1]] (* Harvey P. Dale, Jul 13 2014 *)

Select[Prime[Range[2 10^8]], Union[PrimeQ[# + {2, 6, 8, 12, 18, 20}]] == {True} &] (* Vincenzo Librandi, Oct 01 2015 *)

PROG

(Perl) use ntheory ":all"; say for sieve_prime_cluster(1, 1e9, 2, 6, 8, 12, 18, 20); # Dana Jacobsen, Sep 30 2015

(MAGMA) [p: p in PrimesUpTo(2*10^8) | forall{p+r: r in [2, 6, 8, 12, 18, 20] | IsPrime(p+r)}]; // Vincenzo Librandi, Oct 01 2015

CROSSREFS

Sequence in context: A055311 A116622 A013794 * A201249 A144837 A085017

Adjacent sequences:  A022006 A022007 A022008 * A022010 A022011 A022012

KEYWORD

nonn

AUTHOR

Warut Roonguthai

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy .

Last modified February 11 00:17 EST 2016. Contains 268159 sequences.