A099816 -id:A099816 - cp's OEIS frontend

A099817 Bisection of A000796 (decimal expansion of Pi).

1, 1, 9, 6, 3, 8, 7, 3, 3, 4, 2, 4, 3, 3, 7, 5, 2, 8, 1, 7, 6, 3, 9, 7, 1, 5, 2, 9, 4, 4, 5, 2, 0, 8, 6, 0, 2, 6, 0, 9, 8, 2, 0, 4, 2, 3, 2, 1, 0, 7, 8, 1, 8, 8, 5, 3, 8, 3, 6, 4, 0, 3, 4, 6, 9, 5, 5, 2, 3, 7, 5, 5, 4, 8, 2, 4, 1, 1, 4, 0, 8, 1, 2, 0, 9, 8, 2, 1, 5, 5, 6, 4, 2, 9, 8, 5, 9, 0, 8, 9, 4, 2, 8, 0, 7

Offset: 1

N. J. A. Sloane, Nov 19 2004

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Cf. A000796, A099816.

Take[RealDigits[Pi,10,230][[1]],{2,-1,2}] (* Harvey P. Dale, Aug 11 2024 *)

More terms from Joshua Zucker, May 15 2006

A306389 Partial sums of (k-th digit of decimal expansion of Pi multiplied by (-1)^k).

Original entry on oeis.org

-3, -2, -6, -5, -10, -1, -3, 3, -2, 1, -4, 4, -5, 2, -7, -4, -6, -3, -11, -7, -13, -11, -17, -13, -16, -13, -21, -18, -20, -13, -22, -17, -17, -15, -23, -15, -19, -18, -27, -20, -21, -15, -24, -21, -30, -21, -24, -17, -22, -21, -21, -16, -24, -22, -22, -13, -20, -16, -25, -21, -25, -20, -29, -27, -30, -30, -37, -29, -30, -24, -28

Offset: 1

Luca Petrone, Feb 12 2019

a(n) > 0 for n = 8, 10, 12, 14, 16124, 16126, ... and a(n) = 0 for n = 16120, 16161, 16937, ... - Michel Marcus, Feb 13 2019

Cf. A000796, A046974, A099816, A099817.

Accumulate@ MapIndexed[(-1)^First[#2]*#1 &, First@ RealDigits[Pi, 10, 71]] (* Michael De Vlieger, Feb 15 2019 *)

a(n) = Sum_{k=1..n} (-1)^k*A000796(k).

a(n) = Sum_{k=1..floor(n/2)} A099817(k) - Sum_{k=1..floor((n+1)/2)} A099816(k). - Michel Marcus, Feb 16 2019

cp's OEIS Frontend

A099817 Bisection of A000796 (decimal expansion of Pi).

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