# [seqfan] A172323 ff.

Klaus Brockhaus klaus-brockhaus at t-online.de
Sun Feb 28 18:21:59 CET 2010

```%C A172338 a(n)= n*3,9681187850686669899366200102371....
%C A172337 a(n)= n*5,9623761014199904396165484903099.....
%C A172336 a(n)=n*5,0197648378370843419209099916802......
%C A172334 a(n)= n*5,3376020830328665866466676089764....
%C A172332 a(n)= n*5,8416192529637789895283949362018...
%C A172331 a)n)= n*6,2513025865285798836208370211098....
%C A172330 a(n)= n*6,9221760658193891422341540041412....
%C A172329 a(n)=n*4,7308383527284948979166214608804...
%C A172328 a(n)=n*5,0486755979242771426423790781766....
%C A172327 a(n)=n*5,552692767855189545524106405402....
%C A172326 a(n)=n*4,059964873437685639303304477849....
%C A172325 a(n)=n*4,3778021186334678840290620951451.....
%C A172324 a(n)=n*4,8818192885643802869107894223705....
%C A172323 a(n)=n*3,650281539872884745210862392941......

Comments should be explaining, not wrong and confusing. Something like
a(n) = integer part of n*3.968118...
would do, and six digits after the decimal POINT are more than
enough (for explanation, not necessarily for computation).

And I wonder if sequences like
A172330 Floor(n*(sqrt(13)+sqrt(11))).
should be in the OEIS (arbitrary parameters!).
On the other hand is
A171970 <http://oeis.org/classic/A171970>  Integer part of the
height of an equilateral triangle with side length n.
an example of a similar sequence that is well motivated.

Those comments should be corrected or deleted by the author himself
and not by anyone else, unless he prefers to withdraw the sequences.

```