OFFSET
1,1
COMMENTS
Each term represents the radius of an interval (x,y), where x (A260086) and y (A260087) form a pair of amicable numbers (A259933). The midpoint and length of each interval can be found in A275316 and A275469, respectively.
A term will be odd if and only if y-x = 2 mod 4. This occurs when x and y have the same parity but their average has the opposite parity.
LINKS
Timothy L. Tiffin, Table of n, a(n) for n = 1..142
VaxaSoftware, List of amicable numbers from 1 to 20,000,000 [142 pairs].
EXAMPLE
a(1) = (284-220)/2 = 64/2 = 32, a(2) = (1210-1184)/2 = 26/2 = 13, and a(3) = (2924-2620)/2 = 304/2 = 152.
CROSSREFS
KEYWORD
nonn
AUTHOR
Timothy L. Tiffin, Jul 28 2016
STATUS
approved