OFFSET
1,1
COMMENTS
Searched up to 10^18. Rick Regan mentions these four numbers, also found by Bill Beckmann, at the end of his webpage. - T. D. Noe, Aug 18 2012
LINKS
FORMULA
A050812(n) = 4.
EXAMPLE
8 is palindromic in bases 3, 7, 9, and 10.
121 is palindromic in bases 3, 7, 8, and 10.
373 is palindromic in bases 4, 7, 9, and 10.
786435 is palindromic in bases 2, 4, 7, and 8.
MATHEMATICA
n = -1; t = {}; While[Length[t] < 4, n++; If[Count[Table[s = IntegerDigits[n, m]; s == Reverse[s], {m, 2, 10}], True] == 4, AppendTo[t, n]]]; t
CROSSREFS
KEYWORD
nonn,base,hard
AUTHOR
T. D. Noe, Jul 18 2012
STATUS
approved