OFFSET
1,1
EXAMPLE
a(3)=9091 because 10^4-9091 = 909 and concatenating produces the palindrome
9091909.
MATHEMATICA
Select[Range[923000], PalindromeQ[FromDigits[Join[IntegerDigits[#], IntegerDigits[ 10^IntegerLength[ #]-#]]]]&] (* Harvey P. Dale, Nov 01 2022 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Jason Earls, Aug 02 2005
STATUS
approved