A043080 - OEIS

A043080

a(n) = (s(n) + 9)/10, where s(n) is the n-th base 10 palindrome that starts with 1.

1, 2, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 101, 112, 123, 134, 145, 156, 167, 178, 189, 200, 1001, 1011, 1021, 1031, 1041, 1051, 1061, 1071, 1081, 1091, 1102, 1112, 1122, 1132, 1142, 1152, 1162, 1172, 1182, 1192, 1203, 1213, 1223, 1233, 1243, 1253, 1263, 1273

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..50.

FORMULA

a(n) = (A043036(n)+9)/10. - Michael S. Branicky, Nov 04 2025

MATHEMATICA

(#+9)/10&/@Select[Range[100000], PalindromeQ[#]&&IntegerDigits[#][[1]]==1&] (* Harvey P. Dale, Jul 20 2024 *)

PROG

(Python)

from itertools import count, islice, product