OFFSET
1,3
COMMENTS
No other terms < 10^17. It is likely that there are no more terms. - Chai Wah Wu, Mar 20 2020
EXAMPLE
400 = 112211_3 = 1111_7 = 484_9.
PROG
(Sage)
[n for n in (0..100000) if Word(n.digits(3)).is_palindrome() and Word(n.digits(7)).is_palindrome() and Word(n.digits(9)).is_palindrome()]
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Jeremias M. Gomes, Sep 23 2018
STATUS
approved