login
A099295
Number of times the digit 4 appears in the first 10^n digits of Pi.
11
1, 10, 93, 1012, 9971, 100230, 1001093, 10003863, 100011958, 999937688, 10000032702, 100000357857
OFFSET
1,2
REFERENCES
Alfred S. Posamentier & Ingmar Lehmann, A Biography of the World's Most Mysterious Number, Prometheus Books, Amherst, NY 2004, page 129.
LINKS
Eric Weisstein's World of Mathematics, Pi Digits
MATHEMATICA
$MaxPrecision = 1100000; dp = Drop[ RealDigits[Pi, 10, 1000010] [[1]], 1]; Table[ Count[ Take[dp, 10^n], 4], {n, 6}]
Module[{pid=RealDigits[Pi, 10, 10^7][[1]], ac}, ac=Accumulate[If[#==4, 1, 0]&/@pid]; Table[ac[[10^n]], {n, 7}]] (* Generates the first 7 terms of the sequence. *) (* Harvey P. Dale, Jan 07 2020 *)
KEYWORD
nonn,base
AUTHOR
Robert G. Wilson v, Oct 11 2004
STATUS
approved