[seqfan] Re: nice base-dependent sequence

hv at crypt.org hv at crypt.org
Mon Jun 7 02:36:46 CEST 2010


Douglas McNeil <mcneil at hku.hk> wrote:
:> It'll free me from running hopelessly Mmca for hours and hours.
:> With this I actually give up.
:
:Okay, I'm out too.   This sequence has thorns.
:
:Only managed to get 78 terms; a(79) >  36015000000 ~ 3.6e10.
:Confirmation of the terms beyond n=50 would be good if someone out
:there has spare cycles..  I divided the search up into parts and
:collation errors are always possible (tr: inevitable.)
:
:A177834 = [1, 2, 6, 12, 45, 54, 56, 56, 245, 504, 1440, 1440, 5044,
:5044, 10456, 10569, 11704, 11704, 11704, 13608, 13608, 13608, 26460,
:26460, 198007, 258064, 264600, 264600, 475440, 475440, 1754608,
:1754608, 2258064, 2258064, 2646004, 2646004, 2992520, 11525580,
:12586089, 12592840, 12592840, 12592840, 18232560, 18232560, 18232560,
:18232560, 117590440, 117590440, 117882560, 134316008, 138756006,
:192454002, 349296600, 349296600, 349296600, 349296600, 349296600,
:1153946800, 1186966004, 1186966004, 1643540850, 1869660025,
:2488236800, 2488236800, 2488236800, 2488236800, 11150468640,
:11150468640, 11150468640, 11150468640, 11150468640, 11150468640,
:15041406912, 15041406912, 15041406912, 15041406912, 18673200276,
:18673200276]

I confirm these, took about 11 CPU hours with an adaptation of the
C code I wrote for A169858.

Hugo




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