cp's OEIS Frontend

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.

%I A138069 #9 Feb 03 2023 04:54:09
%S A138069 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,
%T A138069 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,
%U A138069 2,8,1,8,2,8,1,8,2,8,1,7,2
%N 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.
%C A138069 Also, successive digits of the numbers A135696(n).
%e A138069 Triangle begins:
%e A138069 .............. 2
%e A138069 ........... 2, 7, 2
%e A138069 ........ 2, 7, 1, 7, 2
%e A138069 ..... 2, 7, 1, 8, 1, 7, 2
%e A138069 .. 2, 7, 1, 8, 2, 8, 1, 7, 2
%t A138069 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 *)
%Y A138069 Decimal expansion of e: A001113. Cf. A135634, A135696, A138068.
%K A138069 easy,nonn,tabf,base
%O A138069 1,1
%A A138069 _Omar E. Pol_, Mar 03 2008