Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #13 Mar 20 2020 20:15:41
%S 0,1,2,4,8,40,100,164,328,400,8200,14762,532900
%N Numbers in base 10 that are palindromic in bases 3, 7, and 9.
%C Intersection of A014190, A029954, and A029955.
%C No other terms < 10^17. It is likely that there are no more terms. - _Chai Wah Wu_, Mar 20 2020
%e 400 = 112211_3 = 1111_7 = 484_9.
%o (Sage)
%o [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()]
%Y Cf. A014190 (base 3), A029954 (base 7), and A029955 (base 9).
%K nonn,base,more
%O 1,3
%A _Jeremias M. Gomes_, Sep 23 2018