OFFSET

1,1

COMMENTS

Each term represents the length of an interval (x,y), where x (A260086) and y (A260087) form a pair of amicable numbers (A259933). The midpoint and radius of each interval can be found in A275316 and A275470, respectively.

Each term will be even as long as there does not exist an amicable pair where x and y have 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 = 64, a(2) = 1210 - 1184 = 26, and a(3) = 2924 - 2620 = 304.

CROSSREFS

KEYWORD

nonn

AUTHOR

Timothy L. Tiffin, Jul 28 2016

STATUS

approved