novaBBS - rec.puzzles - 1000.......0001 is nonPrime (or Composite) --- suggest how to prove this ?

1000.......0001 is nonPrime (or Composite) --- suggest how to prove this ?

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Subject: 1000.......0001 is nonPrime (or Composite) --- suggest how
to prove this ?
From: henha...@gmail.com (henh...@gmail.com)
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by: henh...@gmail.com - Fri, 19 Aug 2022 18:28 UTC

1000.......0001 <--- i can thnk of some properties of this one

(e.g. -- even (>2) digits , then div. by 11)

after (11 and) 101 (prime), there's (probably) no more primes of this form

Can someone suggest how to prove this ?

_____________________________

i know that 1111...1111 (in any Base) is NonPrime
( if there are even digits (>2) , or )
if the Number of digits is nonPrime (or Composite)

Subject	Author
1000.......0001 is nonPrime (or Composite) --- suggest how	henh...@gmail.com

Doing gets it done.

interests / rec.puzzles / 1000.......0001 is nonPrime (or Composite) --- suggest how to prove this ?