|
%I #6 Oct 09 2021 17:28:40
%S 9,99,909,939,949,959,969,979,989,999,9009,9119,9229,9339,9449,9559,
%T 9669,9779,9889,9999,90009,90109,90209,90309,90409,90509,90609,90809,
%U 90909,91119,91219,91319,91419,91519,91619,91719,91819,91919,92029,92129,92229,92329
%N Palindromic composite numbers starting with a digit 9.
%C Subsequence of A032350 (palindromic nonprime numbers) and A002113 (palindromic numbers). Complement of A128375 (palindromic primes starting with a digit 9) with respect to A043044 (palindromic numbers starting with a digit 9).
%H Jaroslav Krizek, <a href="/A222729/b222729.txt">Table of n, a(n) for n = 1..1050</a>
%t Select[Range[100000],PalindromeQ[#]&&CompositeQ[#]&&IntegerDigits[#][[1]] == 9&] (* _Harvey P. Dale_, Oct 09 2021 *)
%Y Cf. A032350, A002113, A128375, A043044.
%K nonn,base
%O 1,1
%A _Jaroslav Krizek_, Mar 03 2013
|
