A346122 n times the n-th digit of the decimal expansion of Pi.

3, 2, 12, 4, 25, 54, 14, 48, 45, 30, 55, 96, 117, 98, 135, 48, 34, 54, 152, 80, 126, 44, 138, 96, 75, 78, 216, 84, 58, 210, 279, 160, 0, 68, 280, 288, 148, 38, 351, 280, 41, 252, 387, 132, 405, 414, 141, 336, 245, 50, 0, 260, 424, 108, 0, 504, 399, 232, 531

Offset

1,1

Links

Table of n, a(n) for n=1..59.

Index entries for sequences related to the number Pi

Example

The first  digit of the decimal expansion of Pi is 3, so a(1) = 1*3 = 3.
The second digit of the decimal expansion of Pi is 1, so a(2) = 2*1 = 2.
The third  digit of the decimal expansion of Pi is 4, so a(3) = 3*4 = 12.

Mathematica

Module[{nn=120, pid}, pid=RealDigits[Pi, 10, nn][[1]]; Table[n pid[[n]], {n, nn}]]

Prog

(Python)
from sympy import S
def aupton(terms):
    digits_of_pi = "0" + str(S.Pi.n(terms+1)).replace('.', '')
    return [n*int(digits_of_pi[n]) for n in range(1, terms+1)]
print(aupton(59)) # Michael S. Branicky, Jul 08 2021

Crossrefs

Cf. A000796, A014976 (zeros), A053745 (fixed points).

Cf. A053746, A053747, A053748, A053749, A053750, A053751, A053752, A053753.

Sequence in context: A078563 A016560 A122407 * A232752 A195200 A098646

Adjacent sequences: A346119 A346120 A346121 * A346123 A346124 A346125

Keyword

base,nonn

Author

Harvey P. Dale, Jul 05 2021

Status

approved