A083632 Starting positions of strings of four 7's in the decimal expansion of Pi.

1589, 5241, 5322, 5863, 29504, 32478, 33107, 35457, 40792, 52313, 69841, 81356, 87288, 95735, 96505, 96984, 126389, 135083, 137923, 138108, 145767, 151494, 156637, 162248, 162249, 188346, 197069, 203946, 208362, 211588, 221435, 233147

Offset: 1

Author

Rick L. Shepherd, May 04 2003

Keywords

• base
• nonn

Comments

Starting position counted from and after the decimal point. - Harvey P. Dale, Feb 22 2023

Links

• Index entries for sequences related to the number Pi
• Dave Andersen, Pi-Search Page
• Eric Weisstein's World of Mathematics, Pi Digits.

Crossrefs

Cf. A083631 (three 7's), A083633 (five 7's).

Programs

Mathematica

Transpose[StringPosition[StringDrop[ToString[N[Pi,9! ]],2],"7777"]][[1]] (* Vladimir Joseph Stephan Orlovsky, Jun 19 2009 *)
SequencePosition[RealDigits[Pi,10,240000][[1]],{7,7,7,7}][[;;,1]]-1 (* Harvey P. Dale, Feb 22 2023 *)