A074907 Aliquot sequence starting at 570.

570, 870, 1290, 1878, 1890, 3870, 6426, 10854, 13830, 19434, 20886, 21606, 25098, 26742, 26754, 40446, 63234, 77406, 110754, 171486, 253458, 295740, 647748, 1077612, 1467588, 1956812, 2109796, 1889486, 953914, 668966, 353578, 176792

Offset: 0

Author

Robert A. Stump (bee_ess107(AT)msn.com), Sep 30 2002

Keywords

• nonn
• fini
• full

Examples

			a(0) = 570, a(1) = sigma(570) - 570 = 870.
		

References

• R. K. Guy, Unsolved Problems in Number Theory, B6.

Links

• R. J. Mathar, Table of n, a(n) for n = 0..173
• Christophe CLAVIER, Aliquot Sequences

Crossrefs

Cf. A008888, A008889.

Programs

Mathematica

FixedPointList[If[# > 0, DivisorSigma[1, #] - #, 0]&, 570] // Most (* Jean-François Alcover, Mar 28 2020 *)

Formula

a(n+1) = A001065(a(n)). - R. J. Mathar, Oct 11 2017