[seqfan] 2225

Tomasz Ordowski tomaszordowski at gmail.com
Wed May 29 11:54:09 CEST 2019

Dear SeqFans,

I have the following problem:

What is the smallest odd number that,
preceded by any number of 1's in base 2,
gives only composite numbers?

I also ask for the smallest prime of this property.

Best regards,

Thomas Ordowski

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