OFFSET
1,1
COMMENTS
Or, numbers that are palindromic and begin with 5.
LINKS
Jaroslav Krizek, Table of n, a(n) for n = 1..2222
MATHEMATICA
palQ[n_Integer, base_Integer] := Module[{idn = IntegerDigits[n, base]}, idn == Reverse[idn]]; Select[Range[0, 100000], IntegerDigits[#][[1]] == 5 && palQ[#, 10] &] (* T. D. Noe, Mar 12 2013 *)
Select[5*Range[11000], IntegerDigits[#]==Reverse[IntegerDigits[#]]&] (* Harvey P. Dale, Nov 29 2015 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved