The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A083631 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A083631

Starting positions of strings of three 7's in the decimal expansion of Pi.
(history; published version)

#15 by Harvey P. Dale at Mon Mar 13 11:53:27 EDT 2023

STATUS

editing

approved

#14 by Harvey P. Dale at Mon Mar 13 11:53:24 EDT 2023

COMMENTS

Position counted from and after decimal point. - Harvey P. Dale, Mar 13 2023

MATHEMATICA

SequencePosition[RealDigits[Pi, 10, 33000][[1]], {7, 7, 7}][[;; , 1]]-1 (* Harvey P. Dale, Mar 13 2023 *)

STATUS

approved

editing

#13 by Bruno Berselli at Fri Jan 16 03:50:44 EST 2015

STATUS

proposed

approved

#12 by Jon E. Schoenfield at Fri Jan 16 03:50:13 EST 2015

STATUS

editing

proposed

#11 by Jon E. Schoenfield at Fri Jan 16 03:50:11 EST 2015

NAME

Starting positions of strings of 3 three 7's in the decimal expansion of Pi.

MATHEMATICA

q=9!; z=7; a=RealDigits[Pi, 10, q]; lst={}; Do[b=a[[1]][[n]]; c=a[[1]][[n+1]]; d=a[[1]][[n+2]]; If[b==z&&c==z&&d==z, AppendTo[lst, n-1]], {n, q-2}]; lst [From _(* _Vladimir Joseph Stephan Orlovsky_, Jun 19 2009] *)

STATUS

approved

editing

#10 by R. J. Mathar at Fri Jan 11 16:18:22 EST 2013

STATUS

editing

approved

#9 by R. J. Mathar at Fri Jan 11 16:18:18 EST 2013

LINKS

Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PiDigits.html">Link to a section of The World of MathematicsPi Digits.</a>

STATUS

approved

editing

#8 by Russ Cox at Sat Mar 31 12:38:07 EDT 2012

MATHEMATICA

q=9!; z=7; a=RealDigits[Pi, 10, q]; lst={}; Do[b=a[[1]][[n]]; c=a[[1]][[n+1]]; d=a[[1]][[n+2]]; If[b==z&&c==z&&d==z, AppendTo[lst, n-1]], {n, q-2}]; lst [From _Vladimir Joseph Stephan Orlovsky (4vladimir(AT)gmail.com), _, Jun 19 2009]

Discussion

Sat Mar 31

12:38

OEIS Server: https://oeis.org/edit/global/876

#7 by Russ Cox at Fri Mar 30 17:36:40 EDT 2012

AUTHOR

_Rick L. Shepherd (rshepherd2(AT)hotmail.com), _, May 04 2003

Discussion

Fri Mar 30

17:36

OEIS Server: https://oeis.org/edit/global/176

#6 by Russ Cox at Sun Jul 10 18:39:10 EDT 2011

LINKS

<a href="/Sindx_index/Ph.html#Pi314">Index entries for sequences related to the number Pi</a>

Discussion

Sun Jul 10

18:39

OEIS Server: https://oeis.org/edit/global/67