[seqfan] Re: Mystery tour with a(n)=sigma(a(n-1))

Joerg Arndt arndt at jjj.de
Thu Feb 18 08:45:33 CET 2010

There appears to be an issue with nToAlisigofn.ps

Using gv I get the (ghostscript) error:

Execution stack:
   %interp_exit   .runexec2   --nostringval--   --nostringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--   --nostringval--   false   1   %stopped_push   1   3   %oparray_pop   1   3   %oparray_pop   --nostringval--   1   3   %oparray_pop   1   3   %oparray_pop   .runexec2   --nostringval--   --nostESP Ghostscript 8.15.3: Unrecoverable error, exit code 1
ringval--   --nostringval--   2   %stopped_push   --nostringval--   --nostringval--
Dictionary stack:
   --dict:1136/3371(ro)(G)--   --dict:0/20(G)--   --dict:108/200(L)--   --dict:52/200(L)--
Current allocation mode is local
Last OS error: 11
Current file position is 4084
ESP Ghostscript 8.15.3: Unrecoverable error, exit code 1

But I do see the neat graph upon rescaling to 0.100 (smallest).

Same with second file

Funny enough plain ghostview only says:
  Warning: Could not allocate backing pixmap in main window.
But works just fine for both files (again, need to downscale)
So the issue may really be caused by huge (horiz) dimension.

The following works:
  convert nToAlisigofn.ps nToAlisigofn.png
it gives a (500k) file nToAlisigofn.png:
 PNG image data, 20345 x 1340, 16-bit grayscale, non-interlaced

...which makes kuickshow hang  8-)

* Richard Mathar <mathar at strw.leidenuniv.nl> [Feb 17. 2010 19:49]:
> Under the map of n -> sigma(n)-n = A001065(n) the primes all flush into 1,
> so there are two graphs, one with the 1, too crowded in some sense,
> http://www.strw.leidenuniv.nl/~mathar/progs/nToAlisigofn.ps 
> and one without
> http://www.strw.leidenuniv.nl/~mathar/progs/nToAlisigofn2.ps 
> Richard Mathar
> _______________________________________________
> Seqfan Mailing list - http://list.seqfan.eu/

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