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A few interesting CCs

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  • Gary Chaffey
    I have been looking at Henri Lifchitx s site on numbers of the form (2^n-b)*2^n-1. I decided to look at a similar form (2^(3*n)-b)*2^(2*n)-1 and
    Message 1 of 1 , Apr 5, 2005
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      I have been looking at Henri Lifchitx's site on numbers of the form
      (2^n-b)*2^n-1. I decided to look at a similar form (2^(3*n)-b)*2^(2*n)-1 and 2^(2*n)-b)*2^(3*n)-1. A few interesting Cunningham chains fell out of the wash. They are small but none the less I think an interesting form:-

      (2^(3*61)-92)*2^(2*61)-1
      2*((2^(3*61)-92)*2^(2*61)-1)+1
      (2^(3*135)-281)*2^(2*135)-1
      2*((2^(3*135)-281)*2^(2*135)-1)+1
      (2^(2*146)-118)*2^(3*146)-1
      2*((2^(2*146)-118)*2^(3*146)-1)+1
      (2^(2*60)-967)*2^(3*60)-1
      2*((2^(2*60)-967)*2^(3*60)-1)+1
      (2^(2*60)-526)*2^(3*60)-1
      2*((2^(2*60)-526)*2^(3*60)-1)+1
      (2^(2*95)-394)*2^(3*95)-1
      2*((2^(2*95)-394)*2^(3*95)-1)+1
      I haven't looked yet but I am sure there are some larger ones of this form waiting to be discovered...
      Gary


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