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A135698 Palindromes with odd number of digits formed from the reflected decimal expansion of Pi. 4
3, 313, 31413, 3141413, 314151413, 31415951413, 3141592951413, 314159262951413, 31415926562951413, 3141592653562951413, 314159265353562951413, 31415926535853562951413, 3141592653589853562951413, 314159265358979853562951413, 31415926535897979853562951413 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Pi = 3.14159265358979323846264338327... (see A000796).

The number of digits of a(n) is equal to 2n - 1.

The first five members of this sequence are in the example of A119351.

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..250

EXAMPLE

n ........... a(n)

1 ............ 3

2 ........... 313

3 .......... 31413

4 ......... 3141413

5 ........ 314151413

6 ....... 31415951413

7 ...... 3141592951413

8 ..... 314159262951413

9 .... 31415926562951413

10 .. 3141592653562951413

MATHEMATICA

pinxt[n_]:=With[{pid=RealDigits[Pi, 10, 20][[1]]}, Module[{a=Take[pid, n]}, FromDigits[Join[a, Reverse[Most[a]]]]]]; Table[pinxt[n], {n, 1, 15}] (* Harvey P. Dale, Oct 06 2011 *)

CROSSREFS

Cf. A000796, A002113, A119351.

Cf. A135697, A039954.

Sequence in context: A306140 A317373 A083974 * A088102 A039954 A134215

Adjacent sequences:  A135695 A135696 A135697 * A135699 A135700 A135701

KEYWORD

base,nonn

AUTHOR

Omar E. Pol, Mar 01 2008, Mar 28 2008

EXTENSIONS

More terms from Harvey P. Dale, Oct 06 2011

STATUS

approved

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Last modified September 18 20:53 EDT 2019. Contains 327181 sequences. (Running on oeis4.)