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Old 2019-06-26, 03:36   #7
GP2
 
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Sep 2003

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W(W(31)) also has a factor. Here's what we have so far:

Code:
3 3                          prime
5 11                         prime
7 43                         prime
11 683                       1676083,26955961001
13 2731                      67399191280564009798331,2252735939855296339250682011
17 43691                     349529
19 174763                    173085275201
23 2796203                   129469791307,36992613766212121
31 715827883                 3838477063804290331
43 2932031007403
61 768614336404564651        3290547117383710719111443
79 201487636602438195784363  183756724581423634555339057,101874969893105185923314913883
101
127
167
191
199
313
347
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