# What is the pattern in the sequence 1, 3, 4, 7, 6, 12, 8, 15, 13, ??

##### 1 Answer
Jul 31, 2015

This is the sequence A000203 - the sum of the divisors of $n$

#### Explanation:

$1 = 1$
$3 = 1 + 2$
$4 = 1 + 3$
$7 = 1 + 2 + 4$
$6 = 1 + 5$
$12 = 1 + 2 + 3 + 6$
$8 = 1 + 7$
$15 = 1 + 2 + 4 + 8$
$13 = 1 + 3 + 9$