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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A143294 Least a(n) such that p(n)*(p(n)+a(n))-1 and p(n)*(p(n)+a(n))+1 are twin primes with p(i)=i-th prime. 1
1, 1, 1, 53, 7, 11, 43, 11, 13, 43, 11, 17, 1, 53, 43, 67, 1, 197, 227, 157, 11, 53, 31, 1, 17, 1, 53, 49, 23, 73, 17, 1, 13, 179, 19, 269, 47, 311, 97, 67, 13, 17, 67, 11, 157, 59, 41, 11, 253, 53, 187, 79, 137, 157, 67, 133, 211, 11, 83, 67, 53, 13, 59, 7, 17, 703, 47, 17, 109 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Pierre CAMI, Table of n, a(n) for n = 1..12250

EXAMPLE

2*(2+1)-1=5, 2*(2+1)+1=7 5 and 7 twin primes, p(1)=2 so a(1)=1

3*(3+1)-1=11, 3*(3+1)=13 11 and 13 twin primes,p(2)=3 so a(2)=1

CROSSREFS

Sequence in context: A051320 A232126 A078681 * A143428 A143385 A231426

Adjacent sequences:  A143291 A143292 A143293 * A143295 A143296 A143297

KEYWORD

nonn

AUTHOR

Pierre CAMI, Aug 05 2008

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 December 8 17:01 EST 2021. Contains 349596 sequences. (Running on oeis4.)