A036974 Positions of the digit '7' in decimal expansion of Pi.

13, 29, 39, 47, 56, 66, 96, 99, 120, 139, 156, 166, 209, 224, 232, 235, 242, 288, 299, 301, 306, 320, 343, 351, 405, 407, 412, 429, 439, 452, 458, 463, 468, 475, 478, 486, 506, 538, 540, 544, 548, 556, 559, 560, 567, 569, 575, 577, 584, 591, 609, 621, 622

Offset

1,1

Comments

In the first 400 digits of Pi, 7 is rare and only appears 24 times. In the next 250 digits of Pi, 7 is common and appears 38 times. - Bobby Jacobs, Oct 18 2016

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Bobby Jacobs, Pirotechnics

Eric Weisstein's World of Mathematics, Pi Digits

Example

3.141592653589(7)932384626433832(7)950288419(7)1693993(7)510
58209(7)494459230(7)81640628620899862803482534211(7)06(7)9
8214808651328230664(7)093844609550582231(7)25359408128
48111(7)450284102(7)0193852110555964462294895493038196
44288109(7)56659334461284(7)5648233(7)86(7)831652(7)12019091
4564856692346034861045432664821339360(7)2602491412(7)3
(7)2458(7)0066063155881(7)4881520920962829254091(7)1536436
(7)8925903600113305305488204665213841469519415116094
3305(7)2(7)0365(7)5959195309218611(7)381932611(7)93105118548
0(7)44623(7)9962(7)4956(7)351885(7)52(7)2489122(7)93818301194912
98336(7)3362440656643086021394946395224(7)3(7)190(7)021(7)98
60943(7)02(77)053921(7)1(7)62931(7)6(7)523846(7)481846(7)669405132
00056812(7)14526356082(77)85(77)1342(7)5(77)896091(7)363(7)1(7)8(7)...

Mathematica

Flatten@Position[RealDigits[Pi - 3, 10, 500][[1]], 7] (* Robert G. Wilson v, Mar 07 2011 *)
Union[Flatten[SequencePosition[RealDigits[Pi, 10, 700][[1]], {7}]]]-1 (* Harvey P. Dale, Jul 13 2023 *)

Crossrefs

Cf. A000796.

Cf. A037000, A037001, A037002, A037003, A037004, A037005, A037006, A037007, A037008.

Sequence in context: A090690 A160026 A141555 * A045472 A240950 A141293

Adjacent sequences: A036971 A036972 A036973 * A036975 A036976 A036977

Keyword

base,nonn

Author

Nicolau C. Saldanha (nicolau(AT)mat.puc-rio.br)

Status

approved