login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A178565 Numbers n for which the set {210*n-19, 210*n-17, 210*n-13, 210*n-11, 210*n-1, 210*n+1, 210*n+11, 210*n+13, 210*n+17, 210*n+19} forms a symmetrical prime decuplet (also known as Federighi cluster). 0
189111589, 316283205, 340596403, 1363676123, 2288631107, 2548484492, 3761774969, 5693215546, 5806904514, 5983441966, 6153368797, 6435606987, 6909440949, 6955203039, 7216006868, 7582600736, 7657322028, 9403678002 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

n is always +/- 4 (mod 11).

LINKS

Table of n, a(n) for n=1..18.

Thomas R. Nicely, Dense prime clusters

CROSSREFS

Cf. A145315

Sequence in context: A064593 A084304 A228377 * A195902 A181321 A267770

Adjacent sequences:  A178562 A178563 A178564 * A178566 A178567 A178568

KEYWORD

nonn

AUTHOR

Andrey V. Kulsha, May 29 2010

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 8 19:29 EDT 2020. Contains 336298 sequences. (Running on oeis4.)