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Old 2021-09-26, 01:33   #25
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

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I did test for the 4th AP term.
  • for the lower AP-3, 5^2 | A(4)
  • for the higher AP-3, I have not found a trivial factor, but it is composite.
  • A1 = 5606879602425*2^1290000-1 prime
  • A2 = 33*2^2939063-1 prime
  • A3 = 33*2^2939064-5606879602425*2^1290000-1 prime
  • A4 = 99*2^2939063-5606879602425*2^1290001-1 composite
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