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

Offset: 1

Author

Omar E. Pol, Mar 03 2008

Keywords

• easy
• nonn
• tabf
• base

Comments

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

Examples

			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
		

Crossrefs

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

Programs

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 *)