perplexus.info :: Numbers : Arithmetic prime

Home > Numbers

Arithmetic prime (Posted on 2019-04-25)

What is the smallest positive integer k such that k+1, 2k+1, 3k+1, 4k+1 are all primes?

No Solution Yet Submitted by Danish Ahmed Khan

No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)

Puzzle Answer

Comment 3 of 3 |

The required value of the smallest positive integer k is 330.

*** Don't know whether I can, but will try my best to arrive at an independent derivation (irrespective of whether its included in Sloane's OEIS) at a later date.

Edited on June 4, 2022, 12:33 am

Posted by K Sengupta on 2022-06-04 00:31:40

Please log in:

Login:
Password:
Remember me:

Sign up! \| Forgot password

Search:

Search body:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (13)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info