A054249 - OEIS

A054249

Alternately subtract and add 1 to digits in decimal expansion of Pi.

2, 2, 3, 2, 4, 10, 1, 7, 4, 4, 4, 9, 8, 8, 8, 4, 1, 4, 7, 5, 5, 3, 5, 5, 2, 4, 7, 4, 1, 8, 8, 6, -1, 3, 7, 9, 3, 2, 8, 8, 0, 7, 8, 4, 8, 10, 2, 8, 4, 2, -1, 6, 7, 3, -1, 10, 6, 5, 8, 5, 3, 6, 8, 3, 2, 1, 6, 9, 0, 7, 3, 1, 5, 3, 7, 7, 1, 1, 7, 10, 8, 9, 5, 3, 7, 1, 2, 5, 7, 3, 4, 4, 3, 3, 0, 2, 6, 1, 5, 8, 8

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..101.

R. K. Hoeflin, Ultra Test

EXAMPLE

a(1)= 3 - 1 = 2, a(2)= 1 + 1 = 2, a(3) = 4 - 1 = 3

MATHEMATICA

Total/@Partition[Riffle[RealDigits[Pi, 10, 120][[1]], {-1, 1}, {2, -1, 2}], 2] (* Harvey P. Dale, Jan 20 2016 *)

CROSSREFS

Cf. A000796.