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!)
A079304 Near twin primes of order 18: twin primes (p, p+2) such that p+18 and p+20 are primes. 1
11, 41, 179, 599, 641, 809, 1031, 1301, 1931, 2111, 2711, 3371, 3539, 4001, 4241, 5501, 5639, 5849, 6551, 6761, 7331, 8819, 9419, 11699, 13691, 15269, 16631, 17189, 17579, 18041, 18521, 22091, 22619, 23039, 23669, 26681, 26711, 26861, 30851 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

FORMULA

Seq(d, n) = if(n prime & n+2 prime and n+d prime and n+d+2 prime) output n d=18.

EXAMPLE

11 is a term since 11, 11 + 2 = 13, 11 + 18 = 29 and 11 + 20 = 31 are all primes.

MATHEMATICA

Select[Range[3*10^4], And @@ PrimeQ[# + {0, 2, 18, 20}] &] (* Amiram Eldar, Dec 26 2019 *)

CROSSREFS

A007530 gives twin primes of order 6.

Sequence in context: A213659 A199209 A156733 * A260270 A118572 A333084

Adjacent sequences:  A079301 A079302 A079303 * A079305 A079306 A079307

KEYWORD

easy,nonn

AUTHOR

Cino Hilliard, Feb 09 2003

EXTENSIONS

Offset corrected by Amiram Eldar, Dec 26 2019

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 May 6 21:25 EDT 2021. Contains 343597 sequences. (Running on oeis4.)