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A135696 Palindromes with odd number of digits formed from the reflected decimal expansion of e. 4
2, 272, 27172, 2718172, 271828172, 27182828172, 2718281828172, 271828181828172, 27182818281828172, 2718281828281828172, 271828182848281828172, 27182818284548281828172, 2718281828459548281828172, 271828182845909548281828172, 27182818284590409548281828172 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

e = 2.71828182845904523536028747135... (see A001113).

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 ............. 2

2 ............ 272

3 ........... 27172

4 .......... 2718172

5 ......... 271828172

6 ........ 27182828172

7 ....... 2718281828172

8 ...... 271828181828172

9 ..... 27182818281828172

10 ... 2718281828281828172

MATHEMATICA

nn=20; With[{ed=RealDigits[E, 10, nn][[1]]}, Table[FromDigits[Join[Take[ ed, n], Reverse[Take[ed, n-1]]]], {n, nn}]] (* Harvey P. Dale, Sep 10 2012 *)

CROSSREFS

Cf. A001113, A002113.

Sequence in context: A324596 A007512 A048534 * A008775 A237993 A174710

Adjacent sequences:  A135693 A135694 A135695 * A135697 A135698 A135699

KEYWORD

base,nonn

AUTHOR

Omar E. Pol, Mar 01 2008, corrected Mar 02 2008

EXTENSIONS

More terms from Harvey P. Dale, Sep 10 2012

STATUS

approved

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Last modified September 15 22:10 EDT 2019. Contains 327088 sequences. (Running on oeis4.)