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%I #2 Mar 30 2012 17:34:41
%S 64,26,304,544,136,112,2310,1120,3908,103,1530,3666,1097,21780,784,
%T 15660,646,15554,4416,4512,11356,988,28080,36858,24840,30810,17888,
%U 17150,11680,3510,9536,11440,9328,1724,5184,13888,13140,61110,18504
%N Difference A063990(2n)-A063990(2n-1) between amicable numbers.
%C Note that these are not differences between two members of amicable pairs
%C (see A066539) because A063990 is sorted and may separate pairs of amicable numbers.
%t (*A063990 Amicable numbers.*);
%t s[n_] := DivisorSigma[1, n] - n;
%t AmicableNumberQ[n_] := If[Nest[s, n, 2] == n && ! s[n] == n, True, False];
%t a = Select[Range[10^6], AmicableNumberQ[ # ] &];
%t Table[a[[n + 1]] - a[[n]], {n, 1, Length[a], 2}]
%Y Cf. A063990.
%K nonn
%O 1,1
%A _Roger L. Bagula_, May 29 2010
%E Formula clarified by the Assoc. Eds. of the OEIS - Jun 07 2010
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