The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A135699 Palindromes with odd number of digits formed from the reflected decimal expansion of golden ratio phi. 4
 1, 161, 16161, 1618161, 161808161, 16180308161, 1618033308161, 161803393308161, 16180339893308161, 1618033988893308161, 161803398878893308161, 16180339887478893308161 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Phi = 1.61803398874989484820458683436... (see A001622). The number of digits of a(n) is equal to 2n - 1. LINKS G. C. Greubel, Table of n, a(n) for n = 1..250 EXAMPLE n ............ a(n) 1 ............. 1 2 ............ 161 3 ........... 16161 4 .......... 1618161 5 ......... 161808161 6 ........ 16180308161 7 ....... 1618033308161 8 ...... 161803393308161 9 ..... 16180339893308161 10 ... 1618033988893308161 MATHEMATICA With[{ed = RealDigits[(1 + Sqrt[5])/2, 10, 25][[1]]}, Table[FromDigits[Join[Take[ed, n], Reverse[Take[ed, n - 1]]]], {n, 25}]] (* G. C. Greubel, Oct 27 2016 *) CROSSREFS Cf. A001622, A002113. Sequence in context: A278205 A197089 A278890 * A092312 A207232 A207225 Adjacent sequences: A135696 A135697 A135698 * A135700 A135701 A135702 KEYWORD base,nonn AUTHOR Omar E. Pol, Mar 01 2008 STATUS approved

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

Last modified August 6 17:18 EDT 2024. Contains 374980 sequences. (Running on oeis4.)