A135634 Palindromes formed from the reflected decimal expansion of e.

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

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.

Sequence in context: A307852 A365529 A264836 * A156505 A367979 A256928

Adjacent sequences: A135631 A135632 A135633 * A135635 A135636 A135637

Keyword

base,nonn

Author

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

Status

approved