%I #14 Mar 28 2020 10:14:04
%S 1521,858,1158,1170,2106,2976,5088,8520,17400,38400,88452,196924,
%T 228004,255836,255892,339948,708372,1392748,1392804,2631580,3684548,
%U 3684604,4502876,4502932,4630444,5343604,5343660,13185396,26489484
%N Aliquot sequence starting at 1521.
%C This aliquot sequence starts with the least odd number such that the sequence does not repeat a term after 20 or fewer terms.
%D R. K. Guy, Unsolved Problems in Number Theory, B6.
%H T. D. Noe, <a href="/A074906/b074906.txt">Table of n, a(n) for n = 0..169</a>
%H Christophe CLAVIER, <a href="http://christophe.clavier.free.fr/Aliquot/site/Aliquot.html">Aliquot Sequences</a>
%F a(n+1) = A001065(a(n)). - _R. J. Mathar_, Oct 11 2017
%e a(0)= 1521, a(1) = sigma(1521) - 1521 = 858.
%t FixedPointList[If[# > 0, DivisorSigma[1, #] - #, 0]&, 1521] // Most (* _Jean-François Alcover_, Mar 28 2020 *)
%Y Cf. A008888, A008889.
%K nonn,fini,full
%O 0,1
%A Robert A. Stump (bee_ess107(AT)msn.com), Sep 30 2002