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A135698
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Palindromes with odd number of digits formed from the reflected decimal expansion of Pi.
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2
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3, 313, 31413, 3141413, 314151413, 31415951413, 3141592951413, 314159262951413, 31415926562951413, 3141592653562951413, 314159265353562951413, 31415926535853562951413, 3141592653589853562951413, 314159265358979853562951413, 31415926535897979853562951413
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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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.
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EXAMPLE
| n ........... a(n)
1 ............ 3
2 ........... 313
3 .......... 31413
4 ......... 3141413
5 ........ 314151413
6 ....... 31415951413
7 ...... 3141592951413
8 ..... 314159262951413
9 .... 31415926562951413
10 .. 3141592653562951413
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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}] (* From Harvey P. Dale, Oct 06 2011 *)
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CROSSREFS
| Cf. A000796, A002113, A119351.
Cf. A135697.
Sequence in context: A179109 A062333 A083974 * A088102 A039954 A134215
Adjacent sequences: A135695 A135696 A135697 * A135699 A135700 A135701
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KEYWORD
| base,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Mar 01 2008, Mar 28 2008
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EXTENSIONS
| More terms from Harvey P. Dale, Oct 06 2011
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