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Triangle read by rows: row n lists the digits of A135698(n), the palindromic number with odd number of digits formed from the reflected decimal expansion of Pi.
4

%I #15 Dec 08 2024 16:07:16

%S 3,3,1,3,3,1,4,1,3,3,1,4,1,4,1,3,3,1,4,1,5,1,4,1,3,3,1,4,1,5,9,5,1,4,

%T 1,3,3,1,4,1,5,9,2,9,5,1,4,1,3,3,1,4,1,5,9,2,6,2,9,5,1,4,1,3,3,1,4,1,

%U 5,9,2,6,5,6,2,9,5,1,4,1,3

%N Triangle read by rows: row n lists the digits of A135698(n), the palindromic number with odd number of digits formed from the reflected decimal expansion of Pi.

%C Also, successive digits of the numbers A135698(n).

%H Paolo Xausa, <a href="/A138071/b138071.txt">Table of n, a(n) for n = 1..10000</a> (rows 1..100 of triangle, flattened).

%e Triangle begins:

%e 3

%e 3, 1, 3

%e 3, 1, 4, 1, 3

%e 3, 1, 4, 1, 4, 1, 3

%e 3, 1, 4, 1, 5, 1, 4, 1, 3

%t Table[Join[#[[;; n - 1]], #[[n ;; 1 ;; -1]]], {n, Length[#]}] & [First[RealDigits[Pi, 10, 15]]] (* _Paolo Xausa_, Dec 08 2024 *)

%Y Decimal expansion of Pi: A000796. Cf. A119351, A135697, A135698, A138070.

%K easy,nonn,tabf,base

%O 1,1

%A _Omar E. Pol_, Mar 03 2008