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A037159
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Consider trajectory of n under iteration of map which send x to 3x - sigma(x) if this is >= 0 otherwise stops. Sequence gives values of n which eventually reach 0.
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4
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82, 120, 280, 672, 1464, 3048, 4964, 5568, 5688, 7666, 8969, 9176, 9288, 9514, 9616, 9706, 10132, 10186, 10232, 10478, 11496, 11884, 11914, 12232, 12320, 12820, 13248, 13842, 13854, 13866, 14848, 15076, 15098, 15196, 15364, 15586, 15892
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| A perfect number is a fixed point of this map.
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EXAMPLE
| 82 -> 120 -> 0.
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CROSSREFS
| To see why 1, 16 and 23 are not in the sequence, see A058541, A058542 and A058545. Cf. A037160, A033885, A033945, A033946.
Sequence in context: A025370 A099067 A025361 * A039547 A173087 A044252
Adjacent sequences: A037156 A037157 A037158 * A037160 A037161 A037162
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KEYWORD
| nonn,nice
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AUTHOR
| Naohiro Nomoto (6284968128(AT)geocities.co.jp)
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EXTENSIONS
| Better description from Jud McCranie, Dec 24, 2000.
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