[seqfan] Primes where every other digit is 1
Lars Blomberg
lars.blomberg2 at hotmail.com
Thu Oct 21 11:28:40 CEST 2021
Hello,
Is this of interest:
31,41,61,71,101,131,151,181,191,2131,2141, ...
?
... or 3,7,9.
/Lars Blomberg
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