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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A256842 Initial members of 5 twin primes with the smallest possible difference of 30. 2
39713433671, 66419473031, 71525244611, 286371985811, 480612532451, 535181743301, 789972743471, 1195575264641, 1219449947921, 1256522812841, 1292207447351, 1351477467251, 1450982599271, 1460592638171, 1515361442261, 1592346154541 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

There are 5 twin primes in a group of 39 numbers. The term 5TP39 was suggested by prime number researcher Roger Hargrave on 16-FEB-2003. It is also the lowest number of ten primes.

We only have to test primes of the form p = 2310n + 821 and p = 2310n + 1451.

Similar to A059925, but here we have additionally a twin pair of primes in the middle.

LINKS

Sebastian Petzelberger, Table of n, a(n) for n = 1..10000 The data and the b-file were compiled from the link below.

D. L. P. Ballard, Hargrave Primes

Thomas R. Nicely, Dense prime clusters

CROSSREFS

Cf. A059925.

Sequence in context: A112446 A295460 A216018 * A225886 A199428 A287261

Adjacent sequences:  A256839 A256840 A256841 * A256843 A256844 A256845

KEYWORD

nonn

AUTHOR

Sebastian Petzelberger, Apr 21 2015

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified January 20 02:38 EST 2018. Contains 297938 sequences.