A097614 In the decimal expansion of Pi, the string "0" is found at position 32 counting from the first digit after the decimal point. The string "32" is found at position 15, the string "15" at position 3, the string "3" at position 9, etc.

0, 32, 15, 3, 9, 5, 4, 2, 6, 7, 13, 110, 174, 155, 314, 2120, 5360, 24671, 119546, 193002, 240820, 274454, 153700, 1397287, 17916598, 26245242, 8880928, 7320921, 14726415, 42969065, 35308126, 14978764, 68756682

Offset

0,2

Links

Table of n, a(n) for n=0..32.

Dave Andersen, The Pi-Search Page.

Anders Hellström, Sage program

Formula

a(0) = 0, a(1) = A014777(0) = 32, a(n) = A014777(a(n-1)), for n>1. - Anders Hellström, Jan 21 2017

Mathematica

Function[c, NestList[SequencePosition[c, IntegerDigits@ #][[1, 1]] &, 0, 23]]@ Rest@ First@ RealDigits[N[Pi, 10^7]] (* Michael De Vlieger, Jan 23 2017, Version 10.1 *)

Prog

(PARI) M97614=[]; A097614(n)={while(n > #M97614, M97614=concat(M97614, A014777(A097614(#M97614)))); if(n, M97614[n], 0)} \\ M. F. Hasler, Jun 21 2022
(Python)
def A097614(n):
    while n >= len(A097614.list):
        A097614.list.append(A014777(A097614.list[-1]))
    return A097614.list[n]
A097614.list = [0] # M. F. Hasler, Jun 21 2022

Crossrefs

Cf. A014777.

Sequence in context: A302519 A281720 A303318 * A069892 A070621 A234967

Adjacent sequences: A097611 A097612 A097613 * A097615 A097616 A097617

Keyword

nonn,base

Author

Eric Angelini, Aug 30 2004

Status

approved