A138069 -id:A138069

Search: a138069 -id:a138069

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A138068

Triangle read by rows: row n lists the digits of A135634(n), the palindromic number formed from the reflected decimal expansion of e.

+10
4

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

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

OFFSET

1,1

COMMENTS

Also, successive digits of the numbers A135634(n).

LINKS

Table of n, a(n) for n=1..78.

EXAMPLE

Triangle begins:

...... 2

..... 2,2

.... 2,7,2

... 2,7,7,2

.. 2,7,1,7,2

CROSSREFS

Decimal expansion of e: A001113. Cf. A135634, A135696, A138069.

KEYWORD

easy,nonn,tabl,base

AUTHOR

Omar E. Pol, Mar 03 2008

STATUS

approved

A135634

Palindromes formed from the reflected decimal expansion of e.

+10
3

2, 22, 272, 2772, 27172, 271172, 2718172, 27188172, 271828172, 2718228172, 27182828172, 271828828172, 2718281828172, 27182811828172, 271828181828172, 2718281881828172, 27182818281828172, 271828182281828172

(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 n.

LINKS

Table of n, a(n) for n=1..18.

EXAMPLE

n ... Successive digits of a(n)

1 ............ ( 2 )

2 ........... ( 2 2 )

3 .......... ( 2 7 2 )

4 ......... ( 2 7 7 2 )

5 ........ ( 2 7 1 7 2 )

6 ....... ( 2 7 1 1 7 2 )

7 ...... ( 2 7 1 8 1 7 2 )

8 ..... ( 2 7 1 8 8 1 7 2 )

9 .... ( 2 7 1 8 2 8 1 7 2 )

10 .. ( 2 7 1 8 2 2 8 1 7 2 )

CROSSREFS

Cf. A001113, A002113.

Cf. A138068, A138069.

KEYWORD

base,nonn

AUTHOR

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

STATUS

approved

A138115

Triangle read by rows: row n lists the first n digits of the decimal expansion of e.

+10
1

2, 2, 7, 2, 7, 1, 2, 7, 1, 8, 2, 7, 1, 8, 2, 2, 7, 1, 8, 2, 8, 2, 7, 1, 8, 2, 8, 1, 2, 7, 1, 8, 2, 8, 1, 8, 2, 7, 1, 8, 2, 8, 1, 8, 2, 2, 7, 1, 8, 2, 8, 1, 8, 2, 8, 2, 7, 1, 8, 2, 8, 1, 8, 2, 8, 4, 2, 7, 1, 8, 2, 8, 1, 8, 2, 8, 4, 5

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

OFFSET

1,1

COMMENTS

Also, successive digits of A011543.

LINKS

Table of n, a(n) for n=1..78.

EXAMPLE

Triangle begins:

..... 2

.... 2,7

... 2,7,1

.. 2,7,1,8

. 2,7,1,8,2

MATHEMATICA

Module[{nn=20, ed}, ed=RealDigits[E, 10, nn][[1]]; Flatten[Table[Take[ed, n], {n, nn}]]] (* Harvey P. Dale, Dec 24 2014 *)

CROSSREFS

Cf. A001113, A011543, A138068, A138069.

KEYWORD

easy,nonn,tabl,base

AUTHOR

Omar E. Pol, Mar 14 2008

STATUS

approved

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