

A243955


a(n) is the starting position of the first occurrence of a string of n 9's in the decimal expansion of 2*Pi.


1




OFFSET

1,1


COMMENTS

This sequence denotes the position of the Feynman point in the digits of tau = 2*Pi, from a(3) to a(7). Note how compared with A048940, tau has a Feynman point one digit longer, and one position lower, because at this point, the decimal expansion of Pi is 499999987, giving 99999997 when multiplied by 2.


LINKS

Table of n, a(n) for n=1..8.
Eric Weisstein's World of Mathematics, Feynman Point


EXAMPLE

The position of one consecutive 9 in 2*Pi=6.283185307179 is on the 12th decimal digit.


CROSSREFS

Cf. A048940 (similar with Pi), A019692 (decimal expansion of 2*Pi).
Sequence in context: A258480 A035042 A061593 * A232044 A190216 A160559
Adjacent sequences: A243952 A243953 A243954 * A243956 A243957 A243958


KEYWORD

nonn,base


AUTHOR

Jose Luis Garcia del Castillo, Jun 19 2014


STATUS

approved



