A222814 Numbers (not ending in 0) which are 9 times their digit-reversal.

9801, 98901, 989901, 9899901, 98019801, 98999901, 980109801, 989999901, 9801009801, 9890198901, 9899999901, 98010009801, 98901098901, 98999999901, 980100009801, 980198019801, 989010098901, 989901989901, 989999999901, 9801000009801, 9801989019801, 9890100098901

Offset: 1

Author

N. J. A. Sloane, Mar 11 2013

Keywords

• nonn
• base

Comments

There are Fibonacci(floor((n-2)/2)) terms with n digits (this is essentially A103609). - Ray Chandler, Oct 12 2017

Links

• Ray Chandler, Table of n, a(n) for n = 1..10000
• N. J. A. Sloane, 2178 And All That, Fib. Quart., 52 (2014), 99-120.
• N. J. A. Sloane, 2178 And All That [Local copy]

Crossrefs

Equals 9*A001232.

Programs

Mathematica

okQ[t_]:=t==Reverse[t]&&First[t]!=0&&Min[Length/@Split[t]]>1; Sort[ Flatten[ (9*99)#&/@Flatten[Table[FromDigits/@Select[Tuples[{0,1},n],okQ],{n,12}]]]] (* Harvey P. Dale, Jul 03 2013 *)