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Search: Posts Made By: Viliam Furik
Forum: Dobri 2021-08-29, 00:36
Replies: 21
Views: 4,047
Posted By Viliam Furik
Nope. 22*2-1 - 1 is 23-1, prime. 22*3-1 - 1 is...

Nope. 22*2-1 - 1 is 23-1, prime. 22*3-1 - 1 is 25-1, prime. 22*3+1 - 1 is 27-1, prime. 22*7-1 - 1 is 213-1, prime.
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