Before trying the problems "note your opinion as to whether the observed pattern is known to continue, known not to continue, or not known at all."
Is 7013*2n+1 always composite?
Is 78557*2n+1 always composite?
I know it's our habit to only share a solution or possible solution here on perplexus. With this "Does it continue?" series, feel free to share whether you guessed correctly or not.
Personally I guessed they wouldn't be the same answer, but didn't know how to proceed.
Great solution broll. Much more thorough than the source gives.
Posted by Jer
on 2017-09-17 21:07:16