A138069 - OEIS

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A138069

Triangle read by rows: row n lists the digits of A135696(n), the palindromic number with odd number of digits formed from the reflected decimal expansion of e.

2, 2, 7, 2, 2, 7, 1, 7, 2, 2, 7, 1, 8, 1, 7, 2, 2, 7, 1, 8, 2, 8, 1, 7, 2, 2, 7, 1, 8, 2, 8, 2, 8, 1, 7, 2, 2, 7, 1, 8, 2, 8, 1, 8, 2, 8, 1, 7, 2, 2, 7, 1, 8, 2, 8, 1, 8, 1, 8, 2, 8, 1, 7, 2, 2, 7, 1, 8, 2, 8, 1, 8, 2, 8, 1, 8, 2, 8, 1, 7, 2

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Also, successive digits of the numbers A135696(n).

LINKS

Table of n, a(n) for n=1..81.

EXAMPLE

Triangle begins:

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

........... 2, 7, 2

........ 2, 7, 1, 7, 2

..... 2, 7, 1, 8, 1, 7, 2

.. 2, 7, 1, 8, 2, 8, 1, 7, 2

MATHEMATICA

Module[{nn=10, edg}, edg=RealDigits[E, 10, nn][[1]]; Table[ Join[ Take[ edg, n], Reverse[ Take[edg, n-1]]], {n, nn}]]//Flatten (* Harvey P. Dale, Aug 13 2019 *)

CROSSREFS

Decimal expansion of e: A001113. Cf. A135634, A135696, A138068.

Sequence in context: A110779 A121708 A286370 * A208475 A367197 A082837

Adjacent sequences: A138066 A138067 A138068 * A138070 A138071 A138072

KEYWORD

easy,nonn,tabf,base

AUTHOR

Omar E. Pol, Mar 03 2008

STATUS

approved