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 A121507 Conjectured list of numbers whose aliquot sequence eventually reaches a cycle of length two or more. 8
 220, 284, 562, 1064, 1184, 1188, 1210, 1308, 1336, 1380, 1420, 1490, 1604, 1690, 1692, 1772, 1816, 1898, 2008, 2122, 2152, 2172, 2362, 2542, 2620, 2630, 2652, 2676, 2678, 2856, 2924, 2930, 2950, 2974, 3124, 3162, 3202, 3278, 3286, 3332, 3350, 3360 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS For some numbers the outcome of the aliquot sequence is unknown. Currently, 276 is the least such. LINKS CROSSREFS Cf. A008892, A063769, A063990, A072890, A072891, A098007, A121508. Sequence in context: A217160 A203777 A274116 * A255215 A063990 A259180 Adjacent sequences:  A121504 A121505 A121506 * A121508 A121509 A121510 KEYWORD nonn AUTHOR Joshua Zucker, Aug 04 2006 EXTENSIONS Edited by Don Reble, Aug 15 2006 STATUS approved

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