This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A069024 Palindromic in base 2 as well as in base 10 (initial zeros may be prepended). 0

%I

%S 1,2,3,4,5,6,7,8,9,10,20,30,33,40,60,66,80,90,99,252,272,292,313,330,

%T 585,626,660,717,990,2112,2720,2772,2920,4224,5850,6336,7447,7470,

%U 8448,8580,9009,15351,21120,22122,25752,32223,39993,40904,42240,44244

%N Palindromic in base 2 as well as in base 10 (initial zeros may be prepended).

%e 66 in base 2 is 1000010 which is palindromic if rewritten as 01000010.

%t pal[n_, b_] := (z=IntegerDigits[n, b]) == Reverse[z]; extpal[n_, b_] := If[Mod[n, b]>0, pal[n, b], extpal[n/b, b]]; Select[Range[50000], extpal[ #, 10]&&extpal[ #, 2]&]

%Y Cf. A007632.

%K nonn,base

%O 1,2

%A _Amarnath Murthy_, Apr 02 2002

%E Edited by _Dean Hickerson_, Apr 06 2002

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 14 03:52 EST 2018. Contains 317159 sequences. (Running on oeis4.)