OFFSET
1,1
COMMENTS
Numbers k for which all cyclic shifts of their base-3 expansions give base-3 expansions of prime numbers.
Not known to be infinite.
No other terms <= 10^7.
No other terms <= 10^11. - Lucas A. Brown, Sep 20 2024
LINKS
Lucas A. Brown, Python program.
EXAMPLE
For example, 7 in base 3 is 21, and both 21 and 12 represent primes in base 3.
CROSSREFS
KEYWORD
nonn,base,more,hard
AUTHOR
Jeffrey Shallit, Jun 16 2018
EXTENSIONS
New name from Lucas A. Brown, Sep 24 2024
STATUS
approved