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Old 2020-09-01, 16:44   #534
garambois
 
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"Garambois Jean-Luc"
Oct 2011
France

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Quote:
Originally Posted by EdH View Post
But, as we study these, I'm beginning to get a different feeling for "open" sequences. Open really only means we haven't finished it. 2^552, after index 0, had 9 abundant indices. If, when it reached 168 digits, we stopped, it would have been considered "open" and would have met the search criteria.

For 2^552, yes : 9 abundant indices.
But not 9 even terms !

Just for information : I'm in the Guy-Selfridge camp and I think that one day we'll be able to build a number that we'll be sure is the start of an Open-End sequence that will grow endlessly...
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