A109625 Numbers n such that concatenation of n and its 10's complement is a palindrome.

5, 91, 9091, 9181, 9271, 9361, 9451, 9541, 9631, 9721, 9811, 900991, 901891, 902791, 903691, 904591, 905491, 906391, 907291, 908191, 909091, 910981, 911881, 912781, 913681, 914581, 915481, 916381, 917281, 918181, 919081, 920971, 921871, 922771

Offset

1,1

Links

Table of n, a(n) for n=1..34.

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

Sequence in context: A368776 A340052 A340883 * A266290 A348347 A222903

Adjacent sequences: A109622 A109623 A109624 * A109626 A109627 A109628

Keyword

base,nonn

Author

Jason Earls, Aug 02 2005

Status

approved