A043084 a(n)=(s(n)+5)/10, where s(n)=n-th base 10 palindrome that starts with 5.

1, 6, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 501, 512, 523, 534, 545, 556, 567, 578, 589, 600, 5001, 5011, 5021, 5031, 5041, 5051, 5061, 5071, 5081, 5091, 5102, 5112, 5122, 5132, 5142, 5152, 5162, 5172, 5182, 5192, 5203, 5213

Offset

1,2

Links

Table of n, a(n) for n=1..44.

Mathematica

(#+5)/10 &/@Select[Range[100000], IntegerDigits[#][[1]]==5 && PalindromeQ[#]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jan 31 2018 *)

Crossrefs

Sequence in context: A066303 A301436 A136383 * A335704 A292818 A173082

Adjacent sequences: A043081 A043082 A043083 * A043085 A043086 A043087

Keyword

nonn,base

Author

Clark Kimberling

Status

approved