A073055 - OEIS

A073055

a(n) = product of first n digits in the decimal expansion of Pi, ignoring decimal point.

1, 3, 3, 12, 12, 60, 540, 1080, 6480, 32400, 97200, 486000, 3888000, 34992000, 244944000, 2204496000, 6613488000, 13226976000, 39680928000, 317447424000, 1269789696000, 7618738176000, 15237476352000, 91424858112000, 365699432448000, 1097098297344000

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

COMMENTS

The 33rd digit of Pi is 0, so a(33), a(34), .... = 0. - Philip Bergonio (percyweasley99(AT)yahoo.com), Feb 24 2003

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..100

EXAMPLE

Pi = 3.141592653589793... so a(0) = 1, a(1) = 3, a(2) = 3*1=3, a(3) = 3*1*4=12, a(4) = 3*1*4*1 = 12 and so on.

MATHEMATICA

FoldList[Times, 1, First[RealDigits[N[Pi, 50]]]] (Cunningham)

CROSSREFS

Cf. A000796.

Sequence in context: A032308 A117856 A074850 * A075780 A292515 A078666

Adjacent sequences: A073052 A073053 A073054 * A073056 A073057 A073058

KEYWORD

easy,nonn,base

AUTHOR

Y. Kelly Itakura (yitkr(AT)mta.ca), Aug 22 2002

EXTENSIONS

Corrected and extended by Gabriel Cunningham (gcasey(AT)mit.edu), Oct 25 2004

STATUS

approved