[seqfan] Re: Exercises in what? Logic, English, or Writing?

Joerg Arndt arndt at jjj.de
Mon Mar 1 15:17:36 CET 2010

* Klaus Brockhaus <klaus-brockhaus at t-online.de> [Mar 01. 2010 15:02]:
> %N A002822 Numbers n such that 6n-1, 6n+1 are twin primes.
> [.....]
> %C A002822 Numbers n such that neither 6*n-+1 is nonprime. ..... [From 
> ....., Feb 14 2010]

Suggest to remove this comment.

> Could you imagine that this is possible? How about a comment in A000040, 
> "Numbers that are not nonprime"?

... as an exercise in jesting  8-)


How do I see the truth of the first comment?:
Iff n is not of the form by 6ab+-a+-b, then 6n-1 and 6n+1 are twin primes.

This comment should contain a ref to
A067611 Numbers of the form 6xy +- x +- y, where x, y are positive integers.

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