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

Offset: 0

Author

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

Keywords

• easy
• nonn
• base

Comments

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

Examples

			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.
		

Links

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

Crossrefs

Cf. A000796.

Programs

Mathematica

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

Extensions

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