A180102 - OEIS

A180102

a(1)=1; a(n)=percentage of sum of previous terms represented by n

100, 66, 50, 40, 33, 28, 25, 22, 20, 18, 16, 15, 14, 13, 12, 11, 11, 10, 10, 9, 9, 8, 8, 8, 7, 7, 7, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2

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

OFFSET

2,1

LINKS

Table of n, a(n) for n=2..90.

FORMULA

a(1) = 1

a(n) = 100 * n / (n + n-1 + n-2 + ... + 1)

EXAMPLE

a(3)=50 because 1+2+3=6 and 3 is 50% of 6.

MATHEMATICA

Floor[200/(Range[90]+1)] (* Harvey P. Dale, Jul 24 2011 *)