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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A063912 Numbers n such that n and 2n-11 are primes. 4
7, 11, 17, 29, 41, 47, 59, 71, 89, 101, 131, 137, 179, 197, 227, 239, 251, 257, 347, 419, 449, 461, 479, 491, 521, 557, 587, 599, 617, 647, 659, 719, 761, 797, 809, 839, 911, 929, 941, 971, 1019, 1049, 1061, 1109, 1181, 1217, 1229, 1277 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harry J. Smith, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Prime[Range[3, 2000]], PrimeQ[2 # - 11]&] (* Vincenzo Librandi, Feb 02 2014 *)

PROG

(PARI) { n=0; p=1; for (m=1, 10^9, p=nextprime(p+1); if (isprime(2*p - 11), write("b063912.txt", n++, " ", p); if (n==1000, break)) ) } \\ Harry J. Smith, Sep 02 2009

(MAGMA) [n: n in [4..2000] | IsPrime(n) and IsPrime(2*n-11)]; // Vincenzo Librandi, Feb 02 2014

CROSSREFS

Sequence in context: A021013 A156105 A062574 * A078725 A247478 A174360

Adjacent sequences:  A063909 A063910 A063911 * A063913 A063914 A063915

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, Aug 31 2001

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 17 12:17 EDT 2019. Contains 326057 sequences. (Running on oeis4.)