Quote:
Originally Posted by Googol
It just seemed to me that this passage in the book is implying that there is no such pattern using base 10
|
The base 10 pattern has 8 possible endings, corresponding to the fact that after the first few, all primes are 20k+1, 20k+3, 20k+7, 20k+9, 20k+11, 20k+13, 20k+17, or 20k+19. The sequence 2^n mod 100 repeats in a cycle of length 20. The possible endings are 51, 07, 27, 11, 47, 91, 71, and 87 respectively.
William