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Search: id:A090615
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| A090615 |
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Smallest member of sociable quadruples. |
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+0
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; listen)
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OFFSET
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1,1
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COMMENT
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120 sociable numbers of order 4 are known as of Feb. 2003.
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LINKS
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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
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Cf. A003416, A052470.
Sequence in context: A118900 A126174 A072892 this_sequence A081430 A147670 A058894
Adjacent sequences: A090612 A090613 A090614 this_sequence A090616 A090617 A090618
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KEYWORD
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nonn
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AUTHOR
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Eric Weisstein (eric(AT)weisstein.com), Dec 06, 2003
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