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Search: id:A000173
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| A000173 |
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Unitary-sociable numbers (smallest member of each cycle). |
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+0
3
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| 30, 1482, 2418, 24180, 35238, 263820, 395730, 473298, 698130, 763620, 2212026, 2233554, 172459210, 209524210, 341354790, 384121920, 525150234, 530946330, 582129630, 1799281330, 2069510520, 2514290520, 3344596854, 5251502340
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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If n=product p_i^a_i, d=product p_i^c_i is a unitary divisor of n if each c_i is 0 or a_i.
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REFERENCES
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R. K. Guy, Unsolved Problems in Number Theory, 3rd edition, Sect. B7
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LINKS
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Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 01 2006, Table of n, a(n) for n = 1..44
David Moews, Perfect, amicable and sociable numbers
J. O. M. Pedersen, Tables of Aliquot Cycles
Eric Weisstein's World of Mathematics, Sociable Numbers
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CROSSREFS
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Cf. A034444, A003416, A097323.
Sequence in context: A002456 A107768 A048536 this_sequence A055351 A103917 A089550
Adjacent sequences: A000170 A000171 A000172 this_sequence A000174 A000175 A000176
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KEYWORD
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nonn,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Nov 01 2006
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