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A090615
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Smallest member of sociable quadruples.
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2
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1264460, 2115324, 2784580, 4938136, 7169104, 18048976, 18656380, 28158165, 46722700, 81128632, 174277820, 209524210, 330003580, 498215416, 1236402232, 1799281330, 2387776550, 2717495235, 2879697304, 3705771825, 4424606020
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| 120 sociable numbers of order 4 are known as of Feb. 2003.
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LINKS
| K. Blankenagel, W. Borho, A vom Stein, New amicable four-cycles, Math Comp 72 (2003) vol. 244, 2071.
D. Moews, A list of aliquot cycles of length greater than 2.
Eric Weisstein's World of Mathematics, Sociable Numbers
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CROSSREFS
| Cf. A003416, A052470.
Sequence in context: A126174 A186089 A072892 * A180624 A081430 A147670
Adjacent sequences: A090612 A090613 A090614 * A090616 A090617 A090618
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KEYWORD
| nonn
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com), Dec 06, 2003
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